diff --git a/index.html b/index.html
index e6c4102..c2db3b6 100644
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@@ -2999,7 +2999,7 @@
 </ul></div><div id="menu-toggle"><svg xmlns="http://www.w3.org/2000/svg" style="width:100%; height:100%; stroke:currentColor" viewBox="0 0 120 120" width="54" height="54">
       <title>Menu</title>
       <path stroke-width="10" stroke-linecap="round" d="M30,60 h60  M30,30 m0,5 h60  M30,90 m0,-5 h60"></path>
-    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle">+</span><a href="#messageformat-objects" title="MessageFormat Objects"><span class="secnum">1</span> MessageFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-messageformat-constructor" title="The Intl.MessageFormat Constructor"><span class="secnum">1.1</span> The Intl.MessageFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat" title="Intl.MessageFormat ( source, [ locales [ , options ] ] )"><span class="secnum">1.1.1</span> Intl.MessageFormat ( <var>source</var>, [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-initializemessageformat" title="InitializeMessageFormat ( messageFormat, source, locales, options )"><span class="secnum">1.1.2</span> InitializeMessageFormat ( <var>messageFormat</var>, <var>source</var>, <var>locales</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-messageformat-constructor" title="Properties of the Intl.MessageFormat Constructor"><span class="secnum">1.2</span> Properties of the Intl.MessageFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype" title="Intl.MessageFormat.prototype"><span class="secnum">1.2.1</span> Intl.MessageFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat-internal-slots" title="Internal slots"><span class="secnum">1.2.2</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-messageformat-prototype-object" title="Properties of the Intl.MessageFormat Prototype Object"><span class="secnum">1.3</span> Properties of the Intl.MessageFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype.constructor" title="Intl.MessageFormat.prototype.constructor"><span class="secnum">1.3.1</span> Intl.MessageFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype-tostringtag" title="Intl.MessageFormat.prototype [ @@toStringTag ]"><span class="secnum">1.3.2</span> Intl.MessageFormat.prototype [ @@toStringTag ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype.format" title="Intl.MessageFormat.prototype.format ( [ values [ , onError ] ] )"><span class="secnum">1.3.3</span> Intl.MessageFormat.prototype.format ( [ <var>values</var> [ , <var>onError</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype.formatToParts" title="Intl.MessageFormat.prototype.formatToParts ( [ values [ , onError ] ] )"><span class="secnum">1.3.4</span> Intl.MessageFormat.prototype.formatToParts ( [ <var>values</var> [ , <var>onError</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype.resolvedoptions" title="Intl.MessageFormat.prototype.resolvedOptions ( )"><span class="secnum">1.3.5</span> Intl.MessageFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-messageformat-instances" title="Properties of Intl.MessageFormat Instances"><span class="secnum">1.4</span> Properties of Intl.MessageFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-messageformat-abstracts" title="Abstract Operations for MessageFormat Objects"><span class="secnum">1.5</span> Abstract Operations for MessageFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-getmessagedata" title="GetMessageData ( source )"><span class="secnum">1.5.1</span> GetMessageData ( <var>source</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-getmessagefunctions" title="GetMessageFunctions ( userFunctions )"><span class="secnum">1.5.2</span> GetMessageFunctions ( <var>userFunctions</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-messageformat-numberfunctions" title="MessageFormat Number Functions"><span class="secnum">1.5.2.1</span> MessageFormat Number Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-messageformat-stringfunctions" title="MessageFormat String Functions"><span class="secnum">1.5.2.2</span> MessageFormat String Functions</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-createmessageformatcontext" title="CreateMessageFormatContext ( mf, values, onError )"><span class="secnum">1.5.3</span> CreateMessageFormatContext ( <var>mf</var>, <var>values</var>, <var>onError</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-messagecontextrecord" title="MessageFormatContext Records"><span class="secnum">1.5.3.1</span> MessageFormatContext Records</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-resolvemessage" title="ResolveMessage ( ctx )"><span class="secnum">1.5.4</span> ResolveMessage ( <var>ctx</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-selectpattern" title="SelectPattern ( ctx )"><span class="secnum">1.5.4.1</span> SelectPattern ( <var>ctx</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-selectvariant" title="SelectVariant ( ctx, selectors, variants )"><span class="secnum">1.5.4.2</span> SelectVariant ( <var>ctx</var>, <var>selectors</var>, <var>variants</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-resolveexpression" title="ResolveExpression ( ctx, expression )"><span class="secnum">1.5.5</span> ResolveExpression ( <var>ctx</var>, <var>expression</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-resolvefunction" title="ResolveFunction ( ctx, source, resArg, annotation )"><span class="secnum">1.5.5.1</span> ResolveFunction ( <var>ctx</var>, <var>source</var>, <var>resArg</var>, <var>annotation</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolveunknown" title="ResolveUnknown ( source, value )"><span class="secnum">1.5.5.2</span> ResolveUnknown ( <var>source</var>, <var>value</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-formatmarkuppart" title="FormatMarkupPart ( ctx, markup )"><span class="secnum">1.5.6</span> FormatMarkupPart ( <var>ctx</var>, <var>markup</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-getsource" title="GetSource ( ctx, value )"><span class="secnum">1.5.7</span> GetSource ( <var>ctx</var>, <var>value</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-messagevaluesource" title="MessageValueSource ( mv )"><span class="secnum">1.5.7.1</span> MessageValueSource ( <var>mv</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-handlemessageformaterror" title="HandleMessageFormatError ( ctx, completionRecord )"><span class="secnum">1.5.8</span> HandleMessageFormatError ( <var>ctx</var>, <var>completionRecord</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-resolvefallback" title="ResolveFallback ( source )"><span class="secnum">1.5.9</span> ResolveFallback ( <var>source</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-messagefallbackpart" title="MessageFallbackPart ( source )"><span class="secnum">1.5.9.1</span> MessageFallbackPart ( <var>source</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-messagefallbackstring" title="MessageFallbackString ( source )"><span class="secnum">1.5.9.2</span> MessageFallbackString ( <var>source</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-resolvevalue" title="ResolveValue ( ctx, value )"><span class="secnum">1.5.10</span> ResolveValue ( <var>ctx</var>, <var>value</var> )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">A</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 1 Draft / February 7, 2024</h1><h1 class="title">Intl.MessageFormat</h1>
+    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle">+</span><a href="#messageformat-objects" title="MessageFormat Objects"><span class="secnum">1</span> MessageFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-messageformat-constructor" title="The Intl.MessageFormat Constructor"><span class="secnum">1.1</span> The Intl.MessageFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat" title="Intl.MessageFormat ( source, [ locales [ , options ] ] )"><span class="secnum">1.1.1</span> Intl.MessageFormat ( <var>source</var>, [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-initializemessageformat" title="InitializeMessageFormat ( messageFormat, source, locales, options )"><span class="secnum">1.1.2</span> InitializeMessageFormat ( <var>messageFormat</var>, <var>source</var>, <var>locales</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-messageformat-constructor" title="Properties of the Intl.MessageFormat Constructor"><span class="secnum">1.2</span> Properties of the Intl.MessageFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype" title="Intl.MessageFormat.prototype"><span class="secnum">1.2.1</span> Intl.MessageFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat-internal-slots" title="Internal slots"><span class="secnum">1.2.2</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-messageformat-prototype-object" title="Properties of the Intl.MessageFormat Prototype Object"><span class="secnum">1.3</span> Properties of the Intl.MessageFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype.constructor" title="Intl.MessageFormat.prototype.constructor"><span class="secnum">1.3.1</span> Intl.MessageFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype-tostringtag" title="Intl.MessageFormat.prototype [ @@toStringTag ]"><span class="secnum">1.3.2</span> Intl.MessageFormat.prototype [ @@toStringTag ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype.format" title="Intl.MessageFormat.prototype.format ( [ values [ , onError ] ] )"><span class="secnum">1.3.3</span> Intl.MessageFormat.prototype.format ( [ <var>values</var> [ , <var>onError</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype.formatToParts" title="Intl.MessageFormat.prototype.formatToParts ( [ values [ , onError ] ] )"><span class="secnum">1.3.4</span> Intl.MessageFormat.prototype.formatToParts ( [ <var>values</var> [ , <var>onError</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.messageformat.prototype.resolvedoptions" title="Intl.MessageFormat.prototype.resolvedOptions ( )"><span class="secnum">1.3.5</span> Intl.MessageFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-messageformat-instances" title="Properties of Intl.MessageFormat Instances"><span class="secnum">1.4</span> Properties of Intl.MessageFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-messageformat-abstracts" title="Abstract Operations for MessageFormat Objects"><span class="secnum">1.5</span> Abstract Operations for MessageFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-getmessagedata" title="GetMessageData ( source )"><span class="secnum">1.5.1</span> GetMessageData ( <var>source</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-getmessagefunctions" title="GetMessageFunctions ( userFunctions )"><span class="secnum">1.5.2</span> GetMessageFunctions ( <var>userFunctions</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-messageformat-numberfunctions" title="MessageFormat Number Functions"><span class="secnum">1.5.2.1</span> MessageFormat Number Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-messageformat-stringfunctions" title="MessageFormat String Functions"><span class="secnum">1.5.2.2</span> MessageFormat String Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-messageformat-datetimefunctions" title="MessageFormat DateTime Functions"><span class="secnum">1.5.2.3</span> MessageFormat DateTime Functions</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-createmessageformatcontext" title="CreateMessageFormatContext ( mf, values, onError )"><span class="secnum">1.5.3</span> CreateMessageFormatContext ( <var>mf</var>, <var>values</var>, <var>onError</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-messagecontextrecord" title="MessageFormatContext Records"><span class="secnum">1.5.3.1</span> MessageFormatContext Records</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-resolvemessage" title="ResolveMessage ( ctx )"><span class="secnum">1.5.4</span> ResolveMessage ( <var>ctx</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-selectpattern" title="SelectPattern ( ctx )"><span class="secnum">1.5.4.1</span> SelectPattern ( <var>ctx</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-selectvariant" title="SelectVariant ( ctx, selectors, variants )"><span class="secnum">1.5.4.2</span> SelectVariant ( <var>ctx</var>, <var>selectors</var>, <var>variants</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-resolveexpression" title="ResolveExpression ( ctx, expression )"><span class="secnum">1.5.5</span> ResolveExpression ( <var>ctx</var>, <var>expression</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-resolvefunction" title="ResolveFunction ( ctx, source, resArg, annotation )"><span class="secnum">1.5.5.1</span> ResolveFunction ( <var>ctx</var>, <var>source</var>, <var>resArg</var>, <var>annotation</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolveunknown" title="ResolveUnknown ( source, value )"><span class="secnum">1.5.5.2</span> ResolveUnknown ( <var>source</var>, <var>value</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-formatmarkuppart" title="FormatMarkupPart ( ctx, markup )"><span class="secnum">1.5.6</span> FormatMarkupPart ( <var>ctx</var>, <var>markup</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-getsource" title="GetSource ( ctx, value )"><span class="secnum">1.5.7</span> GetSource ( <var>ctx</var>, <var>value</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-messagevaluesource" title="MessageValueSource ( mv )"><span class="secnum">1.5.7.1</span> MessageValueSource ( <var>mv</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-handlemessageformaterror" title="HandleMessageFormatError ( ctx, completionRecord )"><span class="secnum">1.5.8</span> HandleMessageFormatError ( <var>ctx</var>, <var>completionRecord</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-resolvefallback" title="ResolveFallback ( source )"><span class="secnum">1.5.9</span> ResolveFallback ( <var>source</var> )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-messagefallbackpart" title="MessageFallbackPart ( source )"><span class="secnum">1.5.9.1</span> MessageFallbackPart ( <var>source</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-messagefallbackstring" title="MessageFallbackString ( source )"><span class="secnum">1.5.9.2</span> MessageFallbackString ( <var>source</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-resolvevalue" title="ResolveValue ( ctx, value )"><span class="secnum">1.5.10</span> ResolveValue ( <var>ctx</var>, <var>value</var> )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">A</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 1 Draft / March 18, 2024</h1><h1 class="title">Intl.MessageFormat</h1>
 
 <emu-clause id="messageformat-objects">
   <h1><span class="secnum">1</span> MessageFormat Objects</h1>
@@ -3022,8 +3022,8 @@ <h1><span class="secnum">1.1.1</span> Intl.MessageFormat ( <var>source</var>, [
         <var>source</var>, <var>locales</var>, and <var>options</var>, the following steps are taken:
       </p>
 
-      <emu-alg><ol><li>If NewTarget is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>messageFormat</var> be ?&nbsp;OrdinaryCreateFromConstructor(NewTarget, <emu-xref href="#sec-properties-of-intl-messageformat-prototype-object" id="_ref_4"><a href="#sec-properties-of-intl-messageformat-prototype-object">%MessageFormat.prototype%</a></emu-xref>,
-           « <var class="field">[[InitializedMessageFormat]]</var>, <var class="field">[[LocaleMatcher]]</var>, <var class="field">[[MessageData]]</var>, <var class="field">[[RequestedLocales]]</var>, <var class="field">[[Runtime]]</var> »).</li><li>Return ?&nbsp;<emu-xref aoid="InitializeMessageFormat" id="_ref_5"><a href="#sec-initializemessageformat">InitializeMessageFormat</a></emu-xref>(<var>messageFormat</var>, <var>source</var>, <var>locales</var>, <var>options</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>If NewTarget is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>messageFormat</var> be ?&nbsp;OrdinaryCreateFromConstructor(NewTarget, <emu-xref href="#sec-properties-of-intl-messageformat-prototype-object" id="_ref_5"><a href="#sec-properties-of-intl-messageformat-prototype-object">%MessageFormat.prototype%</a></emu-xref>,
+           « <var class="field">[[InitializedMessageFormat]]</var>, <var class="field">[[LocaleMatcher]]</var>, <var class="field">[[MessageData]]</var>, <var class="field">[[RequestedLocales]]</var>, <var class="field">[[Runtime]]</var> »).</li><li>Return ?&nbsp;<emu-xref aoid="InitializeMessageFormat" id="_ref_6"><a href="#sec-initializemessageformat">InitializeMessageFormat</a></emu-xref>(<var>messageFormat</var>, <var>source</var>, <var>locales</var>, <var>options</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-initializemessageformat" aoid="InitializeMessageFormat">
@@ -3036,8 +3036,8 @@ <h1><span class="secnum">1.1.2</span> InitializeMessageFormat ( <var>messageForm
         The following steps are taken:
       </p>
 
-      <emu-alg><ol><li>If <var>source</var> is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>msgData</var> be ?&nbsp;<emu-xref aoid="GetMessageData" id="_ref_6"><a href="#sec-getmessagedata">GetMessageData</a></emu-xref>(<var>source</var>).</li><li>Let <var>requestedLocales</var> be ?&nbsp;CanonicalizeLocaleList(<var>locales</var>).</li><li>Set <var>options</var> to ?&nbsp;GetOptionsObject(<var>options</var>).</li><li>Let <var>matcher</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"localeMatcher"</emu-val>, <emu-const>string</emu-const>,
-           « <emu-val>"lookup"</emu-val>, <emu-val>"best fit"</emu-val> », <emu-val>"best fit"</emu-val>).</li><li>Let <var>userFunctions</var> be ?&nbsp;Get(<var>options</var>, <emu-val>"functions"</emu-val>).</li><li>Let <var>functions</var> be ?&nbsp;<emu-xref aoid="GetMessageFunctions" id="_ref_7"><a href="#sec-getmessagefunctions">GetMessageFunctions</a></emu-xref>(<var>userFunctions</var>).</li><li>Set <var>messageFormat</var>.<var class="field">[[MessageData]]</var> to <var>msgData</var>.</li><li>Set <var>messageFormat</var>.<var class="field">[[RequestedLocales]]</var> to <var>requestedLocales</var>.</li><li>Set <var>messageFormat</var>.<var class="field">[[LocaleMatcher]]</var> to <var>matcher</var>.</li><li>Set <var>messageFormat</var>.<var class="field">[[Functions]]</var> to <var>functions</var>.</li><li>Return <var>messageFormat</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>If <var>source</var> is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>msgData</var> be ?&nbsp;<emu-xref aoid="GetMessageData" id="_ref_7"><a href="#sec-getmessagedata">GetMessageData</a></emu-xref>(<var>source</var>).</li><li>Let <var>requestedLocales</var> be ?&nbsp;CanonicalizeLocaleList(<var>locales</var>).</li><li>Set <var>options</var> to ?&nbsp;GetOptionsObject(<var>options</var>).</li><li>Let <var>matcher</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"localeMatcher"</emu-val>, <emu-const>string</emu-const>,
+           « <emu-val>"lookup"</emu-val>, <emu-val>"best fit"</emu-val> », <emu-val>"best fit"</emu-val>).</li><li>Let <var>userFunctions</var> be ?&nbsp;Get(<var>options</var>, <emu-val>"functions"</emu-val>).</li><li>Let <var>functions</var> be ?&nbsp;<emu-xref aoid="GetMessageFunctions" id="_ref_8"><a href="#sec-getmessagefunctions">GetMessageFunctions</a></emu-xref>(<var>userFunctions</var>).</li><li>Set <var>messageFormat</var>.<var class="field">[[MessageData]]</var> to <var>msgData</var>.</li><li>Set <var>messageFormat</var>.<var class="field">[[RequestedLocales]]</var> to <var>requestedLocales</var>.</li><li>Set <var>messageFormat</var>.<var class="field">[[LocaleMatcher]]</var> to <var>matcher</var>.</li><li>Set <var>messageFormat</var>.<var class="field">[[Functions]]</var> to <var>functions</var>.</li><li>Return <var>messageFormat</var>.</li></ol></emu-alg>
     </emu-clause>
   </emu-clause>
 
@@ -3052,7 +3052,7 @@ <h1><span class="secnum">1.2</span> Properties of the Intl.MessageFormat Constru
       <h1><span class="secnum">1.2.1</span> Intl.MessageFormat.prototype</h1>
 
       <p>
-        The value of <code>Intl.MessageFormat.prototype</code> is <emu-xref href="#sec-properties-of-intl-messageformat-prototype-object" id="_ref_8"><a href="#sec-properties-of-intl-messageformat-prototype-object">%MessageFormat.prototype%</a></emu-xref>.
+        The value of <code>Intl.MessageFormat.prototype</code> is <emu-xref href="#sec-properties-of-intl-messageformat-prototype-object" id="_ref_9"><a href="#sec-properties-of-intl-messageformat-prototype-object">%MessageFormat.prototype%</a></emu-xref>.
       </p>
       <p>
         This property has the attributes
@@ -3085,7 +3085,7 @@ <h1><span class="secnum">1.3</span> Properties of the Intl.MessageFormat Prototy
       <h1><span class="secnum">1.3.1</span> Intl.MessageFormat.prototype.constructor</h1>
 
       <p>
-        The initial value of <code>Intl.MessageFormat.prototype.constructor</code> is <emu-xref href="#sec-intl-messageformat-constructor" id="_ref_9"><a href="#sec-intl-messageformat-constructor">%MessageFormat%</a></emu-xref>.
+        The initial value of <code>Intl.MessageFormat.prototype.constructor</code> is <emu-xref href="#sec-intl-messageformat-constructor" id="_ref_10"><a href="#sec-intl-messageformat-constructor">%MessageFormat%</a></emu-xref>.
       </p>
     </emu-clause>
 
@@ -3109,7 +3109,7 @@ <h1><span class="secnum">1.3.3</span> Intl.MessageFormat.prototype.format ( [ <v
         <var>values</var> and <var>onError</var>, the following steps are taken:
       </p>
 
-      <emu-alg><ol><li>Let <var>mf</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;RequireInternalSlot(<var>mf</var>, <var class="field">[[InitializedMessageFormat]]</var>).</li><li>Let <var>ctx</var> be ?&nbsp;<emu-xref aoid="CreateMessageFormatContext" id="_ref_10"><a href="#sec-createmessageformatcontext">CreateMessageFormatContext</a></emu-xref>(<var>mf</var>, <var>values</var>, <var>onError</var>).</li><li>Let <var>msg</var> be ?&nbsp;<emu-xref aoid="ResolveMessage" id="_ref_11"><a href="#sec-resolvemessage">ResolveMessage</a></emu-xref>(<var>ctx</var>).</li><li>Let <var>result</var> be an empty String.</li><li>For each element <var>el</var> of <var>msg</var>, do<ol><li>If Type(<var>el</var>) is String, then<ol><li>Let <var>stringValue</var> be <var>el</var>.</li></ol></li><li>Else if Type(<var>el</var>) is Object and <var>el</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Let <var>mv</var> be <var>el</var>.<var class="field">[[MessageValue]]</var>.</li><li>Assert: Type(<var>mv</var>) is Object.</li><li>Let <var>toString</var> be ?&nbsp;Get(<var>mv</var>, <emu-val>"toString"</emu-val>).</li><li>Let <var>toStringResult</var> be Completion(Call(<var>toString</var>, <var>mv</var>)).</li><li>If <var>toStringResult</var> is a normal completion, then<ol><li>Let <var>stringValue</var> be <var>toStringResult</var>.<var class="field">[[Value]]</var>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_12"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>stringResult</var>).</li><li>Let <var>source</var> be <emu-xref aoid="MessageValueSource" id="_ref_13"><a href="#sec-messagevaluesource">MessageValueSource</a></emu-xref>(<var>mv</var>).</li><li>Let <var>stringValue</var> be <emu-xref aoid="MessageFallbackString" id="_ref_14"><a href="#sec-messagefallbackstring">MessageFallbackString</a></emu-xref>(<var>source</var>).</li></ol></li></ol></li><li>Set <var>result</var> to the string-concatenation of <var>result</var> and <var>stringValue</var>.</li></ol></li><li>Return <var>result</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>mf</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;RequireInternalSlot(<var>mf</var>, <var class="field">[[InitializedMessageFormat]]</var>).</li><li>Let <var>ctx</var> be ?&nbsp;<emu-xref aoid="CreateMessageFormatContext" id="_ref_11"><a href="#sec-createmessageformatcontext">CreateMessageFormatContext</a></emu-xref>(<var>mf</var>, <var>values</var>, <var>onError</var>).</li><li>Let <var>msg</var> be ?&nbsp;<emu-xref aoid="ResolveMessage" id="_ref_12"><a href="#sec-resolvemessage">ResolveMessage</a></emu-xref>(<var>ctx</var>).</li><li>Let <var>result</var> be an empty String.</li><li>For each element <var>el</var> of <var>msg</var>, do<ol><li>If Type(<var>el</var>) is String, then<ol><li>Let <var>stringValue</var> be <var>el</var>.</li></ol></li><li>Else if Type(<var>el</var>) is Object and <var>el</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Let <var>mv</var> be <var>el</var>.<var class="field">[[MessageValue]]</var>.</li><li>Assert: Type(<var>mv</var>) is Object.</li><li>Let <var>toString</var> be ?&nbsp;Get(<var>mv</var>, <emu-val>"toString"</emu-val>).</li><li>Let <var>toStringResult</var> be Completion(Call(<var>toString</var>, <var>mv</var>)).</li><li>If <var>toStringResult</var> is a normal completion, then<ol><li>Let <var>stringValue</var> be <var>toStringResult</var>.<var class="field">[[Value]]</var>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_13"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>stringResult</var>).</li><li>Let <var>source</var> be <emu-xref aoid="MessageValueSource" id="_ref_14"><a href="#sec-messagevaluesource">MessageValueSource</a></emu-xref>(<var>mv</var>).</li><li>Let <var>stringValue</var> be <emu-xref aoid="MessageFallbackString" id="_ref_15"><a href="#sec-messagefallbackstring">MessageFallbackString</a></emu-xref>(<var>source</var>).</li></ol></li></ol></li><li>Set <var>result</var> to the string-concatenation of <var>result</var> and <var>stringValue</var>.</li></ol></li><li>Return <var>result</var>.</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-intl.messageformat.prototype.formatToParts">
@@ -3120,7 +3120,7 @@ <h1><span class="secnum">1.3.4</span> Intl.MessageFormat.prototype.formatToParts
         <var>values</var> and <var>onError</var>, the following steps are taken:
       </p>
 
-      <emu-alg><ol><li>Let <var>mf</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;RequireInternalSlot(<var>mf</var>, <var class="field">[[InitializedMessageFormat]]</var>).</li><li>Let <var>ctx</var> be ?&nbsp;<emu-xref aoid="CreateMessageFormatContext" id="_ref_15"><a href="#sec-createmessageformatcontext">CreateMessageFormatContext</a></emu-xref>(<var>mf</var>, <var>values</var>, <var>onError</var>).</li><li>Let <var>msg</var> be ?&nbsp;<emu-xref aoid="ResolveMessage" id="_ref_16"><a href="#sec-resolvemessage">ResolveMessage</a></emu-xref>(<var>ctx</var>).</li><li>Let <var>result</var> be a new empty List.</li><li>For each element <var>mv</var> of <var>msg</var>, do<ol><li>If Type(<var>mv</var>) is String, then<ol><li>Let <var>textPart</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>textPart</var>, <emu-val>"type"</emu-val>, <emu-val>"text"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>textPart</var>, <emu-val>"value"</emu-val>, <var>el</var>).</li><li>Append <var>textPart</var> to <var>result</var>.</li></ol></li><li>Else if Type(<var>el</var>) is Object and <var>el</var> has a <var class="field">[[MessageMarkup]]</var> internal slot, then<ol><li>Let <var>markup</var> be ?&nbsp;<emu-xref aoid="FormatMarkupPart" id="_ref_17"><a href="#sec-formatmarkuppart">FormatMarkupPart</a></emu-xref>(<var>ctx</var>, <var>el</var>.<var class="field">[[MessageMarkup]]</var>).</li><li>Append <var>markup</var> to <var>result</var></li></ol></li><li>Else,<ol><li>Assert: <var>el</var> has a <var class="field">[[MessageValue]]</var> internal slot.</li><li>Let <var>mv</var> be <var>el</var>.<var class="field">[[MessageValue]]</var>.</li><li>Assert: Type(<var>mv</var>) is Object.</li><li>Let <var>toParts</var> be ?&nbsp;Get(<var>mv</var>, <emu-val>"toParts"</emu-val>).</li><li>Let <var>partResult</var> be Completion(Call(<var>toParts</var>, <var>mv</var>)).</li><li>If <var>partResult</var> is a normal completion, then<ol><li>Let <var>parts</var> be <var>partResult</var>.<var class="field">[[Value]]</var>.</li><li>For each element <var>part</var> of <var>parts</var>, append <var>part</var> to <var>result</var>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_18"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>partResult</var>).</li><li>Let <var>source</var> be <emu-xref aoid="MessageValueSource" id="_ref_19"><a href="#sec-messagevaluesource">MessageValueSource</a></emu-xref>(<var>mv</var>).</li><li>Let <var>fallbackPart</var> be <emu-xref aoid="MessageFallbackPart" id="_ref_20"><a href="#sec-messagefallbackpart">MessageFallbackPart</a></emu-xref>(<var>source</var>).</li><li>Append <var>fallbackPart</var> to <var>result</var>.</li></ol></li></ol></li></ol></li><li>Return CreateArrayFromList(<var>result</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>mf</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;RequireInternalSlot(<var>mf</var>, <var class="field">[[InitializedMessageFormat]]</var>).</li><li>Let <var>ctx</var> be ?&nbsp;<emu-xref aoid="CreateMessageFormatContext" id="_ref_16"><a href="#sec-createmessageformatcontext">CreateMessageFormatContext</a></emu-xref>(<var>mf</var>, <var>values</var>, <var>onError</var>).</li><li>Let <var>msg</var> be ?&nbsp;<emu-xref aoid="ResolveMessage" id="_ref_17"><a href="#sec-resolvemessage">ResolveMessage</a></emu-xref>(<var>ctx</var>).</li><li>Let <var>result</var> be a new empty List.</li><li>For each element <var>mv</var> of <var>msg</var>, do<ol><li>If Type(<var>mv</var>) is String, then<ol><li>Let <var>textPart</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>textPart</var>, <emu-val>"type"</emu-val>, <emu-val>"text"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>textPart</var>, <emu-val>"value"</emu-val>, <var>el</var>).</li><li>Append <var>textPart</var> to <var>result</var>.</li></ol></li><li>Else if Type(<var>el</var>) is Object and <var>el</var> has a <var class="field">[[MessageMarkup]]</var> internal slot, then<ol><li>Let <var>markup</var> be ?&nbsp;<emu-xref aoid="FormatMarkupPart" id="_ref_18"><a href="#sec-formatmarkuppart">FormatMarkupPart</a></emu-xref>(<var>ctx</var>, <var>el</var>.<var class="field">[[MessageMarkup]]</var>).</li><li>Append <var>markup</var> to <var>result</var></li></ol></li><li>Else,<ol><li>Assert: <var>el</var> has a <var class="field">[[MessageValue]]</var> internal slot.</li><li>Let <var>mv</var> be <var>el</var>.<var class="field">[[MessageValue]]</var>.</li><li>Assert: Type(<var>mv</var>) is Object.</li><li>Let <var>toParts</var> be ?&nbsp;Get(<var>mv</var>, <emu-val>"toParts"</emu-val>).</li><li>Let <var>partResult</var> be Completion(Call(<var>toParts</var>, <var>mv</var>)).</li><li>If <var>partResult</var> is a normal completion, then<ol><li>Let <var>parts</var> be <var>partResult</var>.<var class="field">[[Value]]</var>.</li><li>For each element <var>part</var> of <var>parts</var>, append <var>part</var> to <var>result</var>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_19"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>partResult</var>).</li><li>Let <var>source</var> be <emu-xref aoid="MessageValueSource" id="_ref_20"><a href="#sec-messagevaluesource">MessageValueSource</a></emu-xref>(<var>mv</var>).</li><li>Let <var>fallbackPart</var> be <emu-xref aoid="MessageFallbackPart" id="_ref_21"><a href="#sec-messagefallbackpart">MessageFallbackPart</a></emu-xref>(<var>source</var>).</li><li>Append <var>fallbackPart</var> to <var>result</var>.</li></ol></li></ol></li></ol></li><li>Return CreateArrayFromList(<var>result</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-intl.messageformat.prototype.resolvedoptions">
@@ -3169,7 +3169,7 @@ <h1><span class="secnum">1.3.5</span> Intl.MessageFormat.prototype.resolvedOptio
     <h1><span class="secnum">1.4</span> Properties of Intl.MessageFormat Instances</h1>
 
     <p>
-      Intl.MessageFormat instances are ordinary objects that inherit properties from <emu-xref href="#sec-properties-of-intl-messageformat-prototype-object" id="_ref_21"><a href="#sec-properties-of-intl-messageformat-prototype-object">%MessageFormat.prototype%</a></emu-xref>.
+      Intl.MessageFormat instances are ordinary objects that inherit properties from <emu-xref href="#sec-properties-of-intl-messageformat-prototype-object" id="_ref_22"><a href="#sec-properties-of-intl-messageformat-prototype-object">%MessageFormat.prototype%</a></emu-xref>.
     </p>
 
     <p>
@@ -3220,7 +3220,7 @@ <h1><span class="secnum">1.5.1</span> GetMessageData ( <var>source</var> )</h1>
       <h1><span class="secnum">1.5.2</span> GetMessageFunctions ( <var>userFunctions</var> )</h1>
       <p>The abstract operation GetMessageFunctions takes argument <var>userFunctions</var> (an Object or undefined) and returns an Object. It determines the functions available during message formatting. It performs the following steps when called:</p>
 
-      <emu-alg><ol><li>Let <var>numberSteps</var> be the algorithm steps defined in <emu-xref href="#sec-messageformat-numberfunctions" id="_ref_1"><a href="#sec-messageformat-numberfunctions">1.5.2.1</a></emu-xref>.</li><li>Let <var>number</var> be CreateBuiltinFunction(<var>numberSteps</var>, <emu-val>3</emu-val>, <emu-val>"number"</emu-val>, «&nbsp;»).</li><li>Let <var>stringSteps</var> be the algorithm steps defined in <emu-xref href="#sec-messageformat-stringfunctions" id="_ref_2"><a href="#sec-messageformat-stringfunctions">1.5.2.2</a></emu-xref>.</li><li>Let <var>string</var> be CreateBuiltinFunction(<var>stringSteps</var>, <emu-val>3</emu-val>, <emu-val>"string"</emu-val>, «&nbsp;»).</li><li>Let <var>functions</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>functions</var>, <emu-val>"number"</emu-val>, <var>number</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>functions</var>, <emu-val>"string"</emu-val>, <var>string</var>).</li><li>For each String <var>name</var> of ?&nbsp;EnumerableOwnProperties(<var>userFunctions</var>, <emu-const>key</emu-const>),<ol><li>Let <var>func</var> be ?&nbsp;Get(<var>userFunctions</var>, <var>name</var>).</li><li>If IsCallable(<var>func</var>) is <emu-val>true</emu-val>, then<ol><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>functions</var>, <var>name</var>, <var>func</var>).</li></ol></li><li>Else,<ol><li>Throw a <emu-val>TypeError</emu-val> exception.</li></ol></li></ol></li><li>Return <var>functions</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>numberSteps</var> be the algorithm steps defined in <emu-xref href="#sec-messageformat-numberfunctions" id="_ref_1"><a href="#sec-messageformat-numberfunctions">1.5.2.1</a></emu-xref>.</li><li>Let <var>number</var> be CreateBuiltinFunction(<var>numberSteps</var>, <emu-val>3</emu-val>, <emu-val>"number"</emu-val>, «&nbsp;»).</li><li>Let <var>stringSteps</var> be the algorithm steps defined in <emu-xref href="#sec-messageformat-stringfunctions" id="_ref_2"><a href="#sec-messageformat-stringfunctions">1.5.2.2</a></emu-xref>.</li><li>Let <var>string</var> be CreateBuiltinFunction(<var>stringSteps</var>, <emu-val>3</emu-val>, <emu-val>"string"</emu-val>, «&nbsp;»).</li><li>Let <var>dateTimeSteps</var> be the algorithm steps defined in <emu-xref href="#sec-messageformat-stringfunctions" id="_ref_3"><a href="#sec-messageformat-stringfunctions">1.5.2.2</a></emu-xref>.</li><li>Let <var>dateTime</var> be CreateBuiltinFunction(<var>dateTimeSteps</var>, <emu-val>3</emu-val>, <emu-val>"string"</emu-val>, «&nbsp;»).</li><li>Let <var>functions</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>functions</var>, <emu-val>"number"</emu-val>, <var>number</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>functions</var>, <emu-val>"string"</emu-val>, <var>string</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>functions</var>, <emu-val>"datetime"</emu-val>, <var>dateTime</var>).</li><li>For each String <var>name</var> of ?&nbsp;EnumerableOwnProperties(<var>userFunctions</var>, <emu-const>key</emu-const>),<ol><li>Let <var>func</var> be ?&nbsp;Get(<var>userFunctions</var>, <var>name</var>).</li><li>If IsCallable(<var>func</var>) is <emu-val>true</emu-val>, then<ol><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>functions</var>, <var>name</var>, <var>func</var>).</li></ol></li><li>Else,<ol><li>Throw a <emu-val>TypeError</emu-val> exception.</li></ol></li></ol></li><li>Return <var>functions</var>.</li></ol></emu-alg>
 
       <emu-clause id="sec-messageformat-numberfunctions">
         <h1><span class="secnum">1.5.2.1</span> MessageFormat Number Functions</h1>
@@ -3231,7 +3231,7 @@ <h1><span class="secnum">1.5.2.1</span> MessageFormat Number Functions</h1>
           When a MessageFormat number function is called with arguments <var>funcCtx</var> (an Object), <var>options</var> (an Object), and <var>input</var> (an ECMAScript language value), the following steps are taken:
         </p>
 
-        <emu-alg><ol><li>Let <var>locale</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"locale"</emu-val>).</li><li>Let <var>localeMatcher</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"localeMatcher"</emu-val>).</li><li>Let <var>source</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"source"</emu-val>).</li><li>Let <var>opts</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>opt</var>, <emu-val>"localeMatcher"</emu-val>, <var>localeMatcher</var>).</li><li>If Type(<var>input</var>) is String, then<ol><li>Set <var>input</var> to ?&nbsp;Call(JSON.parse, %JSON%, « <var>input</var>&nbsp;»).</li></ol></li><li>Else if Type(<var>input</var>) is Object, then<ol><li>Let <var>valueOf</var> be ?&nbsp;Get(<var>input</var>, <emu-val>"valueOf"</emu-val>).</li><li>If IsCallable(<var>valueOf</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>inputOptions</var> be ?&nbsp;Get(<var>input</var>, <emu-val>"options"</emu-val>).</li><li>Perform ?&nbsp;Call(Object.assign, <emu-val>undefined</emu-val>, « <var>opts</var>, <var>inputOptions</var>&nbsp;»).</li><li>Set <var>input</var> to ?&nbsp;Call(<var>valueOf</var>, <var>input</var>).</li></ol></li></ol></li><li>If Type(<var>input</var>) is not Number or BigInt, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>numberOptions</var> be « <emu-val>"minimumIntegerDigits"</emu-val>, <emu-val>"minimumFractionDigits"</emu-val>, <emu-val>"maximumFractionDigits"</emu-val>, <emu-val>"minimumSignificantDigits"</emu-val>, <emu-val>"maximumSignificantDigits"</emu-val>, <emu-val>"roundingIncrement"</emu-val>&nbsp;».</li><li>Let <var>booleanOptions</var> be « <emu-val>"useGrouping"</emu-val>&nbsp;».</li><li>Let <var>select</var> be <emu-val>"cardinal"</emu-val>.</li><li>For each String <var>optName</var> of ?&nbsp;EnumerableOwnProperties(<var>options</var>, <emu-const>key</emu-const>),<ol><li>If <var>optName</var> is not <emu-val>"localeMatcher"</emu-val> and <var>optName</var> is not <emu-val>"type"</emu-val>, then<ol><li>If Type(<var>optValue</var>) is Object, then<ol><li>Let <var>optValueOf</var> be ?&nbsp;Get(<var>optValue</var>, <emu-val>"valueOf"</emu-val>).</li><li>If IsCallable(<var>optValueOf</var>) is <emu-val>true</emu-val>, then<ol><li>Set <var>optValue</var>_ to ?&nbsp;Call(<var>optValueOf</var>, <var>optValue</var>).</li></ol></li></ol></li><li>If <var>optName</var> is <emu-val>"select"</emu-val>, then<ol><li>If <var>optValue</var> is <emu-val>"ordinal"</emu-val> or <var>optValue</var> is <emu-val>"exact"</emu-val>, then<ol><li>Set <var>select</var> to <var>optValue</var></li></ol></li><li>Else if <var>optValue</var> is not <emu-val>"plural"</emu-val>, then<ol><li>Throw a <emu-val>RangeError</emu-val> exception.</li></ol></li></ol></li><li>Else,<ol><li>If Type(<var>optValue</var>) is String, then<ol><li>If <var>numberOptions</var> contains <var>optName</var>, then<ol><li>Set <var>optValue</var> to ToNumber(<var>optValue</var>).</li></ol></li><li>Else if <var>booleanOptions</var> contains <var>optName</var>, then<ol><li>If <var>optValue</var> is <emu-val>"true"</emu-val>, then<ol><li>Set <var>optValue</var> to <emu-val>true</emu-val>.</li></ol></li><li>Else if <var>optValue</var> is <emu-val>"false"</emu-val>, then<ol><li>Set <var>optValue</var> to <emu-val>false</emu-val>.</li></ol></li></ol></li></ol></li><li>Perform ?&nbsp;Set(<var>opts</var>, <var>optName</var>, <var>optValue</var>, <emu-val>true</emu-val>).</li></ol></li></ol></li></ol></li><li>Let <var>numberFormat</var> be ?&nbsp;Construct(%Intl.NumberFormat%, « <var>locale</var>, <var>opts</var>&nbsp;»).</li><li>If <var>select</var> is <emu-val>"exact"</emu-val>, then<ol><li>Perform ?&nbsp;<var>opts</var>.<var class="field">[[Delete]]</var>(<emu-val>"type"</emu-val>).</li><li>Let <var>pluralRules</var> be <emu-val>undefined</emu-val>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;Set(<var>opts</var>, <emu-val>"type"</emu-val>, <var>select</var>, <emu-val>true</emu-val>).</li><li>Let <var>pluralRules</var> be ?&nbsp;Construct(%Intl.PluralRules%, « <var>locale</var>, <var>opts</var>&nbsp;»).</li></ol></li><li>Let <var>selectKeyClosure</var> be a new Abstract Closure with parameters (<var>keys</var>) that captures <var>input</var> and <var>pluralRules</var> and performs the following steps when called:<ol><li>Let <var>keyList</var> be ?&nbsp;CreateListFromArrayLike(<var>keys</var>, « String&nbsp;»).</li><li>Let <var>str</var> be ?&nbsp;ToString(<var>input</var>).</li><li>If <var>keyList</var> contains <var>str</var>, return <var>str</var>.</li><li>If <var>pluralRules</var> is not <emu-val>undefined</emu-val>, then<ol><li>Let <var>category</var> be ?&nbsp;Call(Intl.PluralRules.prototype.select, <var>pluralRules</var>, « <var>input</var>&nbsp;»).</li><li>If <var>keyList</var> contains <var>category</var>, return <var>category</var>.</li></ol></li><li>Return <emu-val>null</emu-val>.</li></ol></li><li>Let <var>selectKey</var> be CreateBuiltinFunction(<var>selectKeyClosure</var>, <emu-val>1</emu-val>, <emu-val>"selectKey"</emu-val>, «&nbsp;»).</li><li>Let <var>toPartsClosure</var> be a new Abstract Closure with no parameters that captures <var>input</var>, <var>source</var>, and <var>numberFormat</var> and performs the following steps when called:<ol><li>Let <var>parts</var> be ?&nbsp;Call(Intl.NumberFormat.prototype.formatToParts, <var>nf</var>, « <var>input</var>&nbsp;»).</li><li>Let <var>result</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"type"</emu-val>, <emu-val>"number"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"locale"</emu-val>, <var>numberFormat</var>.<var class="field">[[Locale]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"parts"</emu-val>, <var>parts</var>).</li><li>Return CreateArrayFromList(« <var>result</var>&nbsp;»).</li></ol></li><li>Let <var>toParts</var> be CreateBuiltinFunction(<var>toPartsClosure</var>, <emu-val>0</emu-val>, <emu-val>"toParts"</emu-val>, «&nbsp;»).</li><li>Let <var>toStringClosure</var> be a new Abstract Closure with no parameters that captures <var>input</var> and <var>numberFormat</var> and performs the following steps when called:<ol><li>Return ?&nbsp;Call(Intl.NumberFormat.prototype.format, <var>nf</var>, « <var>input</var>&nbsp;»).</li></ol></li><li>Let <var>toString</var> be CreateBuiltinFunction(<var>toStringClosure</var>, <emu-val>0</emu-val>, <emu-val>"toString"</emu-val>, «&nbsp;»).</li><li>Let <var>valueOfClosure</var> be a new Abstract Closure with no parameters that captures <var>input</var> and performs the following steps when called:<ol><li>Return <var>input</var>.</li></ol></li><li>Let <var>valueOf</var> be CreateBuiltinFunction(<var>valueOfClosure</var>, <emu-val>0</emu-val>, <emu-val>"valueOf"</emu-val>, «&nbsp;»).</li><li>Let <var>mv</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"type"</emu-val>, <emu-val>"number"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"locale"</emu-val>, <var>numberFormat</var>.<var class="field">[[Locale]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"options"</emu-val>, <var>opts</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"selectKey"</emu-val>, <var>selectKey</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toParts"</emu-val>, <var>toParts</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toString"</emu-val>, <var>toString</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"valueOf"</emu-val>, <var>valueOf</var>).</li><li>Return <var>mv</var>.</li></ol></emu-alg>
+        <emu-alg><ol><li>Let <var>locale</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"locale"</emu-val>).</li><li>Let <var>localeMatcher</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"localeMatcher"</emu-val>).</li><li>Let <var>source</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"source"</emu-val>).</li><li>Let <var>opts</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>opt</var>, <emu-val>"localeMatcher"</emu-val>, <var>localeMatcher</var>).</li><li>If Type(<var>input</var>) is String, then<ol><li>Set <var>input</var> to ?&nbsp;Call(JSON.parse, %JSON%, « <var>input</var>&nbsp;»).</li></ol></li><li>Else if Type(<var>input</var>) is Object, then<ol><li>Let <var>valueOf</var> be ?&nbsp;Get(<var>input</var>, <emu-val>"valueOf"</emu-val>).</li><li>If IsCallable(<var>valueOf</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>inputOptions</var> be ?&nbsp;Get(<var>input</var>, <emu-val>"options"</emu-val>).</li><li>Perform ?&nbsp;Call(Object.assign, <emu-val>undefined</emu-val>, « <var>opts</var>, <var>inputOptions</var>&nbsp;»).</li><li>Set <var>input</var> to ?&nbsp;Call(<var>valueOf</var>, <var>input</var>).</li></ol></li></ol></li><li>If Type(<var>input</var>) is not Number or BigInt, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>numberOptions</var> be « <emu-val>"minimumIntegerDigits"</emu-val>, <emu-val>"minimumFractionDigits"</emu-val>, <emu-val>"maximumFractionDigits"</emu-val>, <emu-val>"minimumSignificantDigits"</emu-val>, <emu-val>"maximumSignificantDigits"</emu-val>, <emu-val>"roundingIncrement"</emu-val>&nbsp;».</li><li>Let <var>booleanOptions</var> be « <emu-val>"useGrouping"</emu-val>&nbsp;».</li><li>Let <var>select</var> be <emu-val>"cardinal"</emu-val>.</li><li>For each String <var>optName</var> of ?&nbsp;EnumerableOwnProperties(<var>options</var>, <emu-const>key</emu-const>),<ol><li>If <var>optName</var> is not <emu-val>"localeMatcher"</emu-val> and <var>optName</var> is not <emu-val>"type"</emu-val>, then <!-- TODO: Fix bad indent --><ol><li>Let <var>optValue</var> be ?&nbsp;Get(<var>options</var>, <var>optName</var>).</li><li>If Type(<var>optValue</var>) is Object, then<ol><li>Let <var>optValueOf</var> be ?&nbsp;Get(<var>optValue</var>, <emu-val>"valueOf"</emu-val>).</li><li>If IsCallable(<var>optValueOf</var>) is <emu-val>true</emu-val>, then<ol><li>Set <var>optValue</var> to ?&nbsp;Call(<var>optValueOf</var>, <var>optValue</var>).</li></ol></li></ol></li><li>If <var>optName</var> is <emu-val>"select"</emu-val>, then<ol><li>If <var>optValue</var> is <emu-val>"ordinal"</emu-val> or <var>optValue</var> is <emu-val>"exact"</emu-val>, then<ol><li>Set <var>select</var> to <var>optValue</var></li></ol></li><li>Else if <var>optValue</var> is not <emu-val>"plural"</emu-val>, then<ol><li>Throw a <emu-val>RangeError</emu-val> exception.</li></ol></li></ol></li><li>Else,<ol><li>If Type(<var>optValue</var>) is String, then<ol><li>If <var>numberOptions</var> contains <var>optName</var>, then<ol><li>Set <var>optValue</var> to ToNumber(<var>optValue</var>).</li></ol></li><li>Else if <var>booleanOptions</var> contains <var>optName</var>, then<ol><li>If <var>optValue</var> is <emu-val>"true"</emu-val>, then<ol><li>Set <var>optValue</var> to <emu-val>true</emu-val>.</li></ol></li><li>Else if <var>optValue</var> is <emu-val>"false"</emu-val>, then<ol><li>Set <var>optValue</var> to <emu-val>false</emu-val>.</li></ol></li></ol></li></ol></li><li>Perform ?&nbsp;Set(<var>opts</var>, <var>optName</var>, <var>optValue</var>, <emu-val>true</emu-val>).</li></ol></li></ol></li></ol></li><li>Let <var>numberFormat</var> be ?&nbsp;Construct(%Intl.NumberFormat%, « <var>locale</var>, <var>opts</var>&nbsp;»).</li><li>If <var>select</var> is <emu-val>"exact"</emu-val>, then<ol><li>Perform ?&nbsp;<var>opts</var>.<var class="field">[[Delete]]</var>(<emu-val>"type"</emu-val>).</li><li>Let <var>pluralRules</var> be <emu-val>undefined</emu-val>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;Set(<var>opts</var>, <emu-val>"type"</emu-val>, <var>select</var>, <emu-val>true</emu-val>).</li><li>Let <var>pluralRules</var> be ?&nbsp;Construct(%Intl.PluralRules%, « <var>locale</var>, <var>opts</var>&nbsp;»).</li></ol></li><li>Let <var>selectKeyClosure</var> be a new Abstract Closure with parameters (<var>keys</var>) that captures <var>input</var> and <var>pluralRules</var> and performs the following steps when called:<ol><li>Let <var>keyList</var> be ?&nbsp;CreateListFromArrayLike(<var>keys</var>, « String&nbsp;»).</li><li>Let <var>str</var> be ?&nbsp;ToString(<var>input</var>).</li><li>If <var>keyList</var> contains <var>str</var>, return <var>str</var>.</li><li>If <var>pluralRules</var> is not <emu-val>undefined</emu-val>, then<ol><li>Let <var>category</var> be ?&nbsp;Call(Intl.PluralRules.prototype.select, <var>pluralRules</var>, « <var>input</var>&nbsp;»).</li><li>If <var>keyList</var> contains <var>category</var>, return <var>category</var>.</li></ol></li><li>Return <emu-val>null</emu-val>.</li></ol></li><li>Let <var>selectKey</var> be CreateBuiltinFunction(<var>selectKeyClosure</var>, <emu-val>1</emu-val>, <emu-val>"selectKey"</emu-val>, «&nbsp;»).</li><li>Let <var>toPartsClosure</var> be a new Abstract Closure with no parameters that captures <var>input</var>, <var>source</var>, and <var>numberFormat</var> and performs the following steps when called:<ol><li>Let <var>parts</var> be ?&nbsp;Call(Intl.NumberFormat.prototype.formatToParts, <var>numberFormat</var>, « <var>input</var>&nbsp;»).</li><li>Let <var>result</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"type"</emu-val>, <emu-val>"number"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"locale"</emu-val>, <var>numberFormat</var>.<var class="field">[[Locale]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"parts"</emu-val>, <var>parts</var>).</li><li>Return CreateArrayFromList(« <var>result</var>&nbsp;»).</li></ol></li><li>Let <var>toParts</var> be CreateBuiltinFunction(<var>toPartsClosure</var>, <emu-val>0</emu-val>, <emu-val>"toParts"</emu-val>, «&nbsp;»).</li><li>Let <var>toStringClosure</var> be a new Abstract Closure with no parameters that captures <var>input</var> and <var>numberFormat</var> and performs the following steps when called:<ol><li>Return ?&nbsp;Call(Intl.NumberFormat.prototype.format, <var>numberFormat</var>, « <var>input</var>&nbsp;»).</li></ol></li><li>Let <var>toString</var> be CreateBuiltinFunction(<var>toStringClosure</var>, <emu-val>0</emu-val>, <emu-val>"toString"</emu-val>, «&nbsp;»).</li><li>Let <var>valueOfClosure</var> be a new Abstract Closure with no parameters that captures <var>input</var> and performs the following steps when called:<ol><li>Return <var>input</var>.</li></ol></li><li>Let <var>valueOf</var> be CreateBuiltinFunction(<var>valueOfClosure</var>, <emu-val>0</emu-val>, <emu-val>"valueOf"</emu-val>, «&nbsp;»).</li><li>Let <var>mv</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"type"</emu-val>, <emu-val>"number"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"locale"</emu-val>, <var>numberFormat</var>.<var class="field">[[Locale]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"options"</emu-val>, <var>opts</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"selectKey"</emu-val>, <var>selectKey</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toParts"</emu-val>, <var>toParts</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toString"</emu-val>, <var>toString</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"valueOf"</emu-val>, <var>valueOf</var>).</li><li>Return <var>mv</var>.</li></ol></emu-alg>
 
         <p>
           The <emu-val>"length"</emu-val> property of a MessageFormat number function is <emu-val>3</emu-val>.
@@ -3253,11 +3253,27 @@ <h1><span class="secnum">1.5.2.2</span> MessageFormat String Functions</h1>
           The <emu-val>"length"</emu-val> property of a MessageFormat string function is <emu-val>3</emu-val>.
         </p>
       </emu-clause>
+
+      <emu-clause id="sec-messageformat-datetimefunctions">
+        <h1><span class="secnum">1.5.2.3</span> MessageFormat DateTime Functions</h1>
+        <p>
+          A MessageFormat dateTime function is an anonymous built-in function.
+        </p>
+        <p>
+          When a MessageFormat dateTime function is called with arguments <var>funcCtx</var> (an Object), <var>options</var> (an Object), and <var>input</var> (an ECMAScript language value), the following steps are taken:
+        </p>
+
+        <emu-alg><ol><li>Let <var>locale</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"locale"</emu-val>).</li><li>Let <var>localeMatcher</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"localeMatcher"</emu-val>).</li><li>Let <var>source</var> be !&nbsp;Get(<var>funcCtx</var>, <emu-val>"source"</emu-val>).</li><li>Let <var>opts</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>opt</var>, <emu-val>"localeMatcher"</emu-val>, <var>localeMatcher</var>).</li><li>If Type(<var>input</var>) is Object, then<ol><li>If HasProperty(<var>input</var>, <emu-val>"options"</emu-val>) is <emu-val>true</emu-val>, then<ol><li>Let <var>inputOptions</var> be ?&nbsp;Get(<var>input</var>, <emu-val>"options"</emu-val>).</li><li>Perform ?&nbsp;Call(Object.assign, <emu-val>undefined</emu-val>, « <var>opts</var>, <var>inputOptions</var>&nbsp;»).</li></ol></li><li>Let <var>valueOf</var> be ?&nbsp;Get(<var>input</var>, <emu-val>"valueOf"</emu-val>).</li><li>If InstanceOfOperator(<var>input</var>, %Date%) is <emu-val>false</emu-val> and IsCallable(<var>valueOf</var>) is <emu-val>true</emu-val>, set <var>input</var> to Call(<var>valueOf</var>, <var>input</var>).</li></ol></li><li>If Type(<var>input</var>) is Number or String, let <var>value</var> be ?&nbsp;Construct(%Date%, « <var>input</var>&nbsp;»).</li><li>Else if Type(<var>input</var>) is Object, let <var>value</var> be <var>input</var>.</li><li>If InstanceOfOperator(<var>value</var>, %Date%) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>For each String <var>optName</var> of ?&nbsp;EnumerableOwnProperties(<var>options</var>, <emu-const>key</emu-const>),<ol><li>If <var>optName</var> is not <emu-val>"locale"</emu-val>, then<ol><li>Let <var>optValue</var> be ?&nbsp;Get(<var>options</var>, <var>optName</var>).</li><li>If Type(<var>optValue</var>) is Object, then<ol><li>Let <var>optValueOf</var> be ?&nbsp;Get(<var>optValue</var>, <emu-val>"valueOf"</emu-val>).</li><li>If IsCallable(<var>optValueOf</var>) is <emu-val>true</emu-val>, then<ol><li>Set <var>optValue</var>_ to ?&nbsp;Call(<var>optValueOf</var>, <var>optValue</var>).</li></ol></li></ol></li><li>If <var>optName</var> is <emu-val>"fractionalSecondDigits"</emu-val>, set <var>optValue</var> to ToNumber(<var>optValue</var>).</li><li>Else if <var>optName</var> is <emu-val>"hour12"</emu-val>, then<ol><li>If <var>optValue</var> is <emu-val>"true"</emu-val>, then<ol><li>Set <var>optValue</var> to <emu-val>true</emu-val>.</li></ol></li><li>Else if <var>optValue</var> is <emu-val>"false"</emu-val>, then<ol><li>Set <var>optValue</var> to <emu-val>false</emu-val>.</li></ol></li></ol></li><li>Else, set <var>optValue</var> to ToString(<var>optValue</var>).</li><li>Perform ?&nbsp;Set(<var>opts</var>, <var>optName</var>, <var>optValue</var>, <emu-val>"true"</emu-val>).</li></ol></li></ol></li><li>Let <var>dateTimeFormat</var> be ?&nbsp;Construct(%Intl.DateTimeFormat%, « <var>locale</var>, <var>opts</var>&nbsp;»).</li><li>Let <var>toPartsClosure</var> be a new Abstract Closure with no parameters that captures <var>value</var>, <var>source</var>, and <var>dateTimeFormat</var> and performs the following steps when called:<ol><li>Let <var>parts</var> be ?&nbsp;Call(Intl.DateTimeFormat.prototype.formatToParts, <var>dateTimeFormat</var>, « <var>value</var>&nbsp;»).</li><li>Let <var>result</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"type"</emu-val>, <emu-val>"datetime"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"locale"</emu-val>, <var>dateTimeFormat</var>.<var class="field">[[Locale]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>result</var>, <emu-val>"parts"</emu-val>, <var>parts</var>).</li><li>Return CreateArrayFromList(« <var>result</var>&nbsp;»).</li></ol></li><li>Let <var>toParts</var> be CreateBuiltinFunction(<var>toPartsClosure</var>, <emu-val>0</emu-val>, <emu-val>"toParts"</emu-val>, «&nbsp;»).</li><li>Let <var>toStringClosure</var> be a new Abstract Closure with no parameters that captures <var>value</var> and <var>dateTimeFormat</var> and performs the following steps when called:<ol><li>Return ?&nbsp;Call(Intl.DateTimeFormat.prototype.format, <var>dateTimeFormat</var>, « <var>value</var>&nbsp;»).</li></ol></li><li>Let <var>toString</var> be CreateBuiltinFunction(<var>toStringClosure</var>, <emu-val>0</emu-val>, <emu-val>"toString"</emu-val>, «&nbsp;»).</li><li>Let <var>valueOfClosure</var> be a new Abstract Closure with no parameters that captures <var>value</var> and performs the following steps when called:<ol><li>Return <var>value</var>.</li></ol></li><li>Let <var>valueOf</var> be CreateBuiltinFunction(<var>valueOfClosure</var>, <emu-val>0</emu-val>, <emu-val>"valueOf"</emu-val>, «&nbsp;»).</li><li>Let <var>mv</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"type"</emu-val>, <emu-val>"datetime"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"locale"</emu-val>, <var>dateTimeFormat</var>.<var class="field">[[Locale]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"options"</emu-val>, <var>opts</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toParts"</emu-val>, <var>toParts</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toString"</emu-val>, <var>toString</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"valueOf"</emu-val>, <var>valueOf</var>).</li><li>Return <var>mv</var>.</li></ol></emu-alg>
+
+        <p>
+          The <emu-val>"length"</emu-val> property of a MessageFormat number function is <emu-val>3</emu-val>.
+        </p>
+      </emu-clause>
     </emu-clause>
 
     <emu-clause id="sec-createmessageformatcontext" type="abstract operation" aoid="CreateMessageFormatContext">
       <h1><span class="secnum">1.5.3</span> CreateMessageFormatContext ( <var>mf</var>, <var>values</var>, <var>onError</var> )</h1>
-      <p>The abstract operation CreateMessageFormatContext takes arguments <var>mf</var> (an Object), <var>values</var> (an Object or undefined), and <var>onError</var> (a Function or undefined) and returns a <emu-xref href="#messageformatcontext-record" id="_ref_22"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>. It initializes the <emu-xref href="#messageformatcontext-record" id="_ref_23"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref> used for pattern selection and formatting. It performs the following steps when called:</p>
+      <p>The abstract operation CreateMessageFormatContext takes arguments <var>mf</var> (an Object), <var>values</var> (an Object or undefined), and <var>onError</var> (a Function or undefined) and returns a <emu-xref href="#messageformatcontext-record" id="_ref_23"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>. It initializes the <emu-xref href="#messageformatcontext-record" id="_ref_24"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref> used for pattern selection and formatting. It performs the following steps when called:</p>
 
       <emu-alg><ol><li>Let <var>localVars</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>).</li><li>Let <var>msgData</var> be <var>mf</var>.<var class="field">[[MessageData]]</var>.</li><li>Let <var>declArray</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"declarations"</emu-val>).</li><li>Let <var>declList</var> be ?&nbsp;CreateListFromArrayLike(<var>declArray</var>).</li><li>For each element <var>decl</var> of <var>declList</var>,<ol><li>Let <var>declName</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>declValue</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[UnresolvedDeclaration]]</var>&nbsp;»).</li><li>Set <var>declValue</var>.<var class="field">[[UnresolvedDeclaration]]</var> to <var>decl</var>.</li><li>Perform ?&nbsp;Set(<var>localVars</var>, <var>declName</var>, <var>declValue</var>, <emu-val>true</emu-val>).</li></ol></li><li>Let <var>ctx</var> be a new Record.</li><li>Set <var>ctx</var>.<var class="field">[[LocalVariables]]</var> to <var>localVars</var>.</li><li>Set <var>ctx</var>.<var class="field">[[MessageFormat]]</var> to <var>mf</var>.</li><li>Set <var>ctx</var>.<var class="field">[[OnError]]</var> to <var>onError</var>.</li><li>Set <var>ctx</var>.<var class="field">[[Values]]</var> to ?&nbsp;GetOptionsObject(<var>values</var>).</li><li>Return <var>ctx</var>.</li></ol></emu-alg>
 
@@ -3265,7 +3281,7 @@ <h1><span class="secnum">1.5.3</span> CreateMessageFormatContext ( <var>mf</var>
         <h1><span class="secnum">1.5.3.1</span> MessageFormatContext Records</h1>
         <p>
           A <dfn id="messageformatcontext-record" tabindex="-1">MessageFormatContext Record</dfn> is used to hold the data required during the formatting of a message.
-          It has the fields defined in <emu-xref href="#table-messageformatcontext-record" id="_ref_3"><a href="#table-messageformatcontext-record">Table 2</a></emu-xref>.
+          It has the fields defined in <emu-xref href="#table-messageformatcontext-record" id="_ref_4"><a href="#table-messageformatcontext-record">Table 2</a></emu-xref>.
         </p>
 
         <emu-table id="table-messageformatcontext-record"><figure><figcaption>Table 2: Record returned by CreateMessageContext</figcaption>
@@ -3308,20 +3324,20 @@ <h1><span class="secnum">1.5.3.1</span> MessageFormatContext Records</h1>
 
     <emu-clause id="sec-resolvemessage" type="abstract operation" aoid="ResolveMessage">
       <h1><span class="secnum">1.5.4</span> ResolveMessage ( <var>ctx</var> )</h1>
-      <p>The abstract operation ResolveMessage takes argument <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_24"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and returns a List of Strings and Objects. It resolves a message into a List of Strings and Objects with either <var class="field">[[MessageMarkup]]</var> or <var class="field">[[MessageValue]]</var> internal slots. It performs the following steps when called:</p>
+      <p>The abstract operation ResolveMessage takes argument <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_25"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and returns a List of Strings and Objects. It resolves a message into a List of Strings and Objects with either <var class="field">[[MessageMarkup]]</var> or <var class="field">[[MessageValue]]</var> internal slots. It performs the following steps when called:</p>
 
-      <emu-alg><ol><li>Let <var>result</var> be an empty List.</li><li>Let <var>pattern</var> be ?&nbsp;<emu-xref aoid="SelectPattern" id="_ref_25"><a href="#sec-selectpattern">SelectPattern</a></emu-xref>(<var>ctx</var>).</li><li>For each element <var>el</var> of <var>pattern</var>,<ol><li>If Type(<var>el</var>) is String, then<ol><li>Append <var>el</var> to <var>result</var>.</li></ol></li><li>Else,<ol><li>Assert: Type(<var>el</var>) is Object.</li><li>Let <var>elType</var> be ?&nbsp;Get(<var>el</var>, <emu-val>"type"</emu-val>).</li><li>If <var>elType</var> is <emu-val>"markup"</emu-val>, then<ol><li>Let <var>res</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[MessageMarkup]]</var>&nbsp;»).</li><li>Set <var>res</var>.<var class="field">[[MessageMarkup]]</var> to <var>el</var>.</li></ol></li><li>Else,<ol><li>Assert: <var>elType</var> is <emu-val>"expression"</emu-val>.</li><li>Let <var>res</var> be <emu-xref aoid="ResolveExpression" id="_ref_26"><a href="#sec-resolveexpression">ResolveExpression</a></emu-xref>(<var>ctx</var>, <var>el</var>).</li></ol></li><li>Append <var>res</var> to <var>result</var>.</li></ol></li></ol></li><li>Return <var>result</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>result</var> be an empty List.</li><li>Let <var>pattern</var> be ?&nbsp;<emu-xref aoid="SelectPattern" id="_ref_26"><a href="#sec-selectpattern">SelectPattern</a></emu-xref>(<var>ctx</var>).</li><li>For each element <var>el</var> of <var>pattern</var>,<ol><li>If Type(<var>el</var>) is String, then<ol><li>Append <var>el</var> to <var>result</var>.</li></ol></li><li>Else,<ol><li>Assert: Type(<var>el</var>) is Object.</li><li>Let <var>elType</var> be ?&nbsp;Get(<var>el</var>, <emu-val>"type"</emu-val>).</li><li>If <var>elType</var> is <emu-val>"markup"</emu-val>, then<ol><li>Let <var>res</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[MessageMarkup]]</var>&nbsp;»).</li><li>Set <var>res</var>.<var class="field">[[MessageMarkup]]</var> to <var>el</var>.</li></ol></li><li>Else,<ol><li>Assert: <var>elType</var> is <emu-val>"expression"</emu-val>.</li><li>Let <var>res</var> be <emu-xref aoid="ResolveExpression" id="_ref_27"><a href="#sec-resolveexpression">ResolveExpression</a></emu-xref>(<var>ctx</var>, <var>el</var>).</li></ol></li><li>Append <var>res</var> to <var>result</var>.</li></ol></li></ol></li><li>Return <var>result</var>.</li></ol></emu-alg>
 
       <emu-clause id="sec-selectpattern" type="abstract operation" aoid="SelectPattern">
         <h1><span class="secnum">1.5.4.1</span> SelectPattern ( <var>ctx</var> )</h1>
-        <p>The abstract operation SelectPattern takes argument <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_27"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and returns a List of Strings and Objects with an internal slot <var class="field">[[MessageValue]]</var>. It selects the pattern to format from the message data model. It performs the following steps when called:</p>
+        <p>The abstract operation SelectPattern takes argument <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_28"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and returns a List of Strings and Objects with an internal slot <var class="field">[[MessageValue]]</var>. It selects the pattern to format from the message data model. It performs the following steps when called:</p>
 
-        <emu-alg><ol><li>Let <var>msgData</var> be <var>ctx</var>.<var class="field">[[MessageFormat]]</var>.<var class="field">[[MessageData]]</var>.</li><li>Let <var>msgType</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"type"</emu-val>).</li><li>If <var>msgType</var> is <emu-val>"message"</emu-val>, then<ol><li>Let <var>pattern</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"pattern"</emu-val>).</li></ol></li><li>Else,<ol><li>Assert: <var>msgType</var> is <emu-val>"select"</emu-val>.</li><li>Let <var>selectorsData</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"selectors"</emu-val>).</li><li>Let <var>selectorExpressions</var> be ?&nbsp;CreateListFromArrayLike(<var>selectorsData</var>, « Object »).</li><li>Let <var>selectors</var> be an empty List.</li><li>For each element <var>selExp</var> of <var>selectorExpressions</var>,<ol><li>Let <var>sel</var> be <emu-xref aoid="ResolveExpression" id="_ref_28"><a href="#sec-resolveexpression">ResolveExpression</a></emu-xref>(<var>ctx</var>, <var>selExp</var>).</li><li>Let <var>selectKey</var> be ?&nbsp;Get(<var>sel</var>.<var class="field">[[MessageValue]]</var>, <emu-val>"selectKey"</emu-val>).</li><li>If IsCallable(<var>selectKey</var>) is <emu-val>true</emu-val>, then<ol><li>Append <var>sel</var>.<var class="field">[[MessageValue]]</var> to <var>selectors</var>.</li></ol></li><li>Else,<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>TypeError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_29"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Append <emu-val>null</emu-val> to <var>selectors</var>.</li></ol></li></ol></li><li>Let <var>variantsArray</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"variants"</emu-val>).</li><li>Let <var>variants</var> be ?&nbsp;CreateListFromArrayLike(<var>variantsArray</var>, « Object »).</li><li>Let <var>selectedVariant</var> be ?&nbsp;<emu-xref aoid="SelectVariant" id="_ref_30"><a href="#sec-selectvariant">SelectVariant</a></emu-xref>(<var>ctx</var>, <var>selectors</var>, <var>variants</var>).</li></ol></li><li>Return ?&nbsp;CreateListFromArrayLike(<var>pattern</var>, « String, Object »).</li></ol></emu-alg>
+        <emu-alg><ol><li>Let <var>msgData</var> be <var>ctx</var>.<var class="field">[[MessageFormat]]</var>.<var class="field">[[MessageData]]</var>.</li><li>Let <var>msgType</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"type"</emu-val>).</li><li>If <var>msgType</var> is <emu-val>"message"</emu-val>, then<ol><li>Let <var>pattern</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"pattern"</emu-val>).</li></ol></li><li>Else,<ol><li>Assert: <var>msgType</var> is <emu-val>"select"</emu-val>.</li><li>Let <var>selectorsData</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"selectors"</emu-val>).</li><li>Let <var>selectorExpressions</var> be ?&nbsp;CreateListFromArrayLike(<var>selectorsData</var>, « Object »).</li><li>Let <var>selectors</var> be an empty List.</li><li>For each element <var>selExp</var> of <var>selectorExpressions</var>,<ol><li>Let <var>sel</var> be <emu-xref aoid="ResolveExpression" id="_ref_29"><a href="#sec-resolveexpression">ResolveExpression</a></emu-xref>(<var>ctx</var>, <var>selExp</var>).</li><li>Let <var>selectKey</var> be ?&nbsp;Get(<var>sel</var>.<var class="field">[[MessageValue]]</var>, <emu-val>"selectKey"</emu-val>).</li><li>If IsCallable(<var>selectKey</var>) is <emu-val>true</emu-val>, then<ol><li>Append <var>sel</var>.<var class="field">[[MessageValue]]</var> to <var>selectors</var>.</li></ol></li><li>Else,<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>TypeError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_30"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Append <emu-val>null</emu-val> to <var>selectors</var>.</li></ol></li></ol></li><li>Let <var>variantsArray</var> be ?&nbsp;Get(<var>msgData</var>, <emu-val>"variants"</emu-val>).</li><li>Let <var>variants</var> be ?&nbsp;CreateListFromArrayLike(<var>variantsArray</var>, « Object »).</li><li>Let <var>selectedVariant</var> be ?&nbsp;<emu-xref aoid="SelectVariant" id="_ref_31"><a href="#sec-selectvariant">SelectVariant</a></emu-xref>(<var>ctx</var>, <var>selectors</var>, <var>variants</var>).</li></ol></li><li>Return ?&nbsp;CreateListFromArrayLike(<var>pattern</var>, « String, Object »).</li></ol></emu-alg>
       </emu-clause>
 
       <emu-clause id="sec-selectvariant" type="implementation-defined abstract operation" aoid="SelectVariant">
         <h1><span class="secnum">1.5.4.2</span> SelectVariant ( <var>ctx</var>, <var>selectors</var>, <var>variants</var> )</h1>
-        <p>The implementation-defined abstract operation SelectVariant takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_31"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>), <var>selectors</var> (a List of Object and Null values), and <var>variants</var> (a List of Objects) and returns an Object.</p>
+        <p>The implementation-defined abstract operation SelectVariant takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_32"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>), <var>selectors</var> (a List of Object and Null values), and <var>variants</var> (a List of Objects) and returns an Object.</p>
             <p>
               It applies the variant selection method defined by
               the "Resolve Preferences", "Filter Variants", and "Sort Variants" steps of the
@@ -3332,7 +3348,7 @@ <h1><span class="secnum">1.5.4.2</span> SelectVariant ( <var>ctx</var>, <var>sel
             <p>
               For the selection, Null values in <var>selectors</var> indicate selectors for which selection will always fail.
               If any errors are encountered during the selection,
-              the <emu-xref aoid="HandleMessageFormatError" id="_ref_32"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref> abstract operation must be called
+              the <emu-xref aoid="HandleMessageFormatError" id="_ref_33"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref> abstract operation must be called
               with <var>ctx</var> and an abrupt Completion Record containing an Error.
             </p>
 
@@ -3348,15 +3364,15 @@ <h1><span class="secnum">1.5.4.2</span> SelectVariant ( <var>ctx</var>, <var>sel
 
     <emu-clause id="sec-resolveexpression" type="abstract operation" aoid="ResolveExpression">
       <h1><span class="secnum">1.5.5</span> ResolveExpression ( <var>ctx</var>, <var>expression</var> )</h1>
-      <p>The abstract operation ResolveExpression takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_33"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>expression</var> (an Object) and returns an Object with an internal slot <var class="field">[[MessageValue]]</var>. It resolves the value of an expression for selection and formatting. It performs the following steps when called:</p>
+      <p>The abstract operation ResolveExpression takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_34"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>expression</var> (an Object) and returns an Object with an internal slot <var class="field">[[MessageValue]]</var>. It resolves the value of an expression for selection and formatting. It performs the following steps when called:</p>
 
-      <emu-alg><ol><li>Let <var>source</var> be ?&nbsp;<emu-xref aoid="GetSource" id="_ref_34"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>ctx</var>, <var>expression</var>).</li><li>Let <var>arg</var> be ?&nbsp;Get(<var>expression</var>, <emu-val>"arg"</emu-val>).</li><li>If <var>arg</var> is <emu-val>undefined</emu-val>, then<ol><li>Let <var>resArg</var> be <emu-val>undefined</emu-val>.</li></ol></li><li>Else,<ol><li>Let <var>resArg</var> be <emu-xref aoid="ResolveValue" id="_ref_35"><a href="#sec-resolvevalue">ResolveValue</a></emu-xref>(<var>ctx</var>, <var>arg</var>).</li><li>If <var>resArg</var> has a <var class="field">[[MessageFallback]]</var> internal slot, return <var>resArg</var>.</li></ol></li><li>Let <var>annotation</var> be ?&nbsp;Get(<var>expression</var>, <emu-val>"annotation"</emu-val>).</li><li>If <var>annotation</var> is <emu-val>undefined</emu-val>, then<ol><li>Assert: <var>resArg</var> is not <emu-val>undefined</emu-val>.</li><li>If Type(<var>resArg</var>) is Object and <var>resArg</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Return <var>resArg</var>.</li></ol></li><li>Else if Type(<var>resArg</var>) is Number or BigInt, then<ol><li>Set <var>annotation</var> to OrdinaryObjectCreate(<emu-val>null</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>annotation</var>, <emu-val>"type"</emu-val>, <emu-val>"function"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>annotation</var>, <emu-val>"name"</emu-val>, <emu-val>"number"</emu-val>).</li></ol></li><li>Else if Type(<var>resArg</var>) is String, then<ol><li>Set <var>annotation</var> to OrdinaryObjectCreate(<emu-val>null</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>annotation</var>, <emu-val>"type"</emu-val>, <emu-val>"function"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>annotation</var>, <emu-val>"name"</emu-val>, <emu-val>"string"</emu-val>).</li></ol></li><li>Else,<ol><li>Return <emu-xref aoid="ResolveUnknown" id="_ref_36"><a href="#sec-resolveunknown">ResolveUnknown</a></emu-xref>(<var>source</var>, <var>resArg</var>).</li></ol></li></ol></li><li>If ?&nbsp;Get(<var>annotation</var>, <emu-val>"type"</emu-val>) is not <emu-val>"function"</emu-val>, then<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>ReferenceError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_37"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Return <emu-xref aoid="ResolveFallback" id="_ref_38"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li><li>Return <emu-xref aoid="ResolveFunction" id="_ref_39"><a href="#sec-resolvefunction">ResolveFunction</a></emu-xref>(<var>ctx</var>, <var>source</var>, <var>resArg</var>, <var>annotation</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>source</var> be ?&nbsp;<emu-xref aoid="GetSource" id="_ref_35"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>ctx</var>, <var>expression</var>).</li><li>Let <var>arg</var> be ?&nbsp;Get(<var>expression</var>, <emu-val>"arg"</emu-val>).</li><li>If <var>arg</var> is <emu-val>undefined</emu-val>, then<ol><li>Let <var>resArg</var> be <emu-val>undefined</emu-val>.</li></ol></li><li>Else,<ol><li>Let <var>resArg</var> be <emu-xref aoid="ResolveValue" id="_ref_36"><a href="#sec-resolvevalue">ResolveValue</a></emu-xref>(<var>ctx</var>, <var>arg</var>).</li><li>If <var>resArg</var> has a <var class="field">[[MessageFallback]]</var> internal slot, return <var>resArg</var>.</li></ol></li><li>Let <var>annotation</var> be ?&nbsp;Get(<var>expression</var>, <emu-val>"annotation"</emu-val>).</li><li>If <var>annotation</var> is <emu-val>undefined</emu-val>, then<ol><li>Assert: <var>resArg</var> is not <emu-val>undefined</emu-val>.</li><li>If Type(<var>resArg</var>) is Object and <var>resArg</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Return <var>resArg</var>.</li></ol></li><li>Else if Type(<var>resArg</var>) is Number or BigInt, then<ol><li>Set <var>annotation</var> to OrdinaryObjectCreate(<emu-val>null</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>annotation</var>, <emu-val>"type"</emu-val>, <emu-val>"function"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>annotation</var>, <emu-val>"name"</emu-val>, <emu-val>"number"</emu-val>).</li></ol></li><li>Else if Type(<var>resArg</var>) is String, then<ol><li>Set <var>annotation</var> to OrdinaryObjectCreate(<emu-val>null</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>annotation</var>, <emu-val>"type"</emu-val>, <emu-val>"function"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>annotation</var>, <emu-val>"name"</emu-val>, <emu-val>"string"</emu-val>).</li></ol></li><li>Else,<ol><li>Return <emu-xref aoid="ResolveUnknown" id="_ref_37"><a href="#sec-resolveunknown">ResolveUnknown</a></emu-xref>(<var>source</var>, <var>resArg</var>).</li></ol></li></ol></li><li>If ?&nbsp;Get(<var>annotation</var>, <emu-val>"type"</emu-val>) is not <emu-val>"function"</emu-val>, then<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>ReferenceError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_38"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Return <emu-xref aoid="ResolveFallback" id="_ref_39"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li><li>Return <emu-xref aoid="ResolveFunction" id="_ref_40"><a href="#sec-resolvefunction">ResolveFunction</a></emu-xref>(<var>ctx</var>, <var>source</var>, <var>resArg</var>, <var>annotation</var>).</li></ol></emu-alg>
 
       <emu-clause id="sec-resolvefunction" type="abstract operation" aoid="ResolveFunction">
         <h1><span class="secnum">1.5.5.1</span> ResolveFunction ( <var>ctx</var>, <var>source</var>, <var>resArg</var>, <var>annotation</var> )</h1>
-        <p>The abstract operation ResolveFunction takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_40"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>), <var>source</var> (a String), <var>resArg</var> (an Object or undefined), and <var>annotation</var> (an Object) and returns an Object with an internal slot <var class="field">[[MessageValue]]</var>. It resolves the value of an expression with a function annotation. It performs the following steps when called:</p>
+        <p>The abstract operation ResolveFunction takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_41"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>), <var>source</var> (a String), <var>resArg</var> (an Object or undefined), and <var>annotation</var> (an Object) and returns an Object with an internal slot <var class="field">[[MessageValue]]</var>. It resolves the value of an expression with a function annotation. It performs the following steps when called:</p>
 
-        <emu-alg><ol><li>Let <var>name</var> be ?&nbsp;Get(<var>annotation</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>function</var> be ?&nbsp;Get(<var>ctx</var>.<var class="field">[[MessageFormat]]</var>.<var class="field">[[Functions]]</var>, <var>name</var>).</li><li>If IsCallable(<var>function</var>) is <emu-val>false</emu-val>, then<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>ReferenceError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_41"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Return <emu-xref aoid="ResolveFallback" id="_ref_42"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li><li>Let <var>funcCtx</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>funcCtx</var>, <emu-val>"locale"</emu-val>, <var>ctx</var>.<var class="field">[[MessageFormat]]</var>.<var class="field">[[RequestedLocales]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>funcCtx</var>, <emu-val>"localeMatcher"</emu-val>, <var>ctx</var>.<var class="field">[[MessageFormat]]</var>.<var class="field">[[LocaleMatcher]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>funcCtx</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Let <var>options</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Let <var>optArray</var> be ?&nbsp;Get(<var>annotation</var>, <emu-val>"options"</emu-val>).</li><li>If <var>optArray</var> is not <emu-val>undefined</emu-val>, then<ol><li>Let <var>optList</var> be ?&nbsp;CreateListFromArrayLike(<var>optArray</var>).</li><li>For each element <var>opt</var> of <var>optList</var>,<ol><li>Let <var>optName</var> be ?&nbsp;Get(<var>opt</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>optValue</var> be ?&nbsp;Get(<var>opt</var>, <emu-val>"value"</emu-val>).</li><li>Let <var>resValue</var> be <emu-xref aoid="ResolveValue" id="_ref_43"><a href="#sec-resolvevalue">ResolveValue</a></emu-xref>(<var>ctx</var>, <var>optValue</var>).</li><li>If Type(<var>resValue</var>) is Object, then<ol><li>If <var>resValue</var> has a <var class="field">[[MessageFallback]]</var> internal slot, then<ol><li>Set <var>resValue</var> to <emu-val>undefined</emu-val>.</li></ol></li><li>Else if <var>resValue</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Set <var>resValue</var> to <var>resValue</var>.<var class="field">[[MessageValue]]</var>.</li></ol></li></ol></li><li>Perform ?&nbsp;CreateDataPropertyOrThrow(<var>options</var>, <var>optName</var>, <var>resValue</var>).</li></ol></li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"options"</emu-val>, <var>resOptions</var>).</li></ol></li><li>Let <var>funcArgs</var> be « <var>funcCtx</var>, <var>options</var>&nbsp;».</li><li>If Type(<var>resArg</var>) is Object and <var>resArg</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Set <var>resArg</var> to <var>resArg</var>.<var class="field">[[MessageValue]]</var>.</li></ol></li><li>If <var>resArg</var> is not <emu-val>undefined</emu-val>, then<ol><li>Append <var>resArg</var> to <var>funcArgs</var>.</li></ol></li><li>Let <var>funcRes</var> be Completion(Call(<var>function</var>, <emu-val>undefined</emu-val>, <var>funcArgs</var>)).</li><li>If <var>funcRes</var> is a normal completion, then<ol><li>Let <var>mv</var> be <var>funcRes</var>.<var class="field">[[Value]]</var>.</li><li>If Type(<var>mv</var>) is Object and Type(? Get(<var>mv</var>, <emu-val>"type"</emu-val>)) is String and Type(? Get(<var>mv</var>, <emu-val>"source"</emu-val>)) is String, then<ol><li>Let <var>result</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[MessageValue]]</var>&nbsp;»).</li><li>Set <var>result</var>.<var class="field">[[MessageValue]]</var> to <var>mv</var>.</li><li>Return <var>result</var>.</li></ol></li><li>Else,<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>TypeError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_44"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Return <emu-xref aoid="ResolveFallback" id="_ref_45"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_46"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>funcRes</var>).</li><li>Return <emu-xref aoid="ResolveFallback" id="_ref_47"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li></ol></emu-alg>
+        <emu-alg><ol><li>Let <var>name</var> be ?&nbsp;Get(<var>annotation</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>function</var> be ?&nbsp;Get(<var>ctx</var>.<var class="field">[[MessageFormat]]</var>.<var class="field">[[Functions]]</var>, <var>name</var>).</li><li>If IsCallable(<var>function</var>) is <emu-val>false</emu-val>, then<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>ReferenceError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_42"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Return <emu-xref aoid="ResolveFallback" id="_ref_43"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li><li>Let <var>funcCtx</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>funcCtx</var>, <emu-val>"locale"</emu-val>, <var>ctx</var>.<var class="field">[[MessageFormat]]</var>.<var class="field">[[RequestedLocales]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>funcCtx</var>, <emu-val>"localeMatcher"</emu-val>, <var>ctx</var>.<var class="field">[[MessageFormat]]</var>.<var class="field">[[LocaleMatcher]]</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>funcCtx</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Let <var>options</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Let <var>optArray</var> be ?&nbsp;Get(<var>annotation</var>, <emu-val>"options"</emu-val>).</li><li>If <var>optArray</var> is not <emu-val>undefined</emu-val>, then<ol><li>Let <var>optList</var> be ?&nbsp;CreateListFromArrayLike(<var>optArray</var>).</li><li>For each element <var>opt</var> of <var>optList</var>,<ol><li>Let <var>optName</var> be ?&nbsp;Get(<var>opt</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>optValue</var> be ?&nbsp;Get(<var>opt</var>, <emu-val>"value"</emu-val>).</li><li>Let <var>resValue</var> be <emu-xref aoid="ResolveValue" id="_ref_44"><a href="#sec-resolvevalue">ResolveValue</a></emu-xref>(<var>ctx</var>, <var>optValue</var>).</li><li>If Type(<var>resValue</var>) is Object, then<ol><li>If <var>resValue</var> has a <var class="field">[[MessageFallback]]</var> internal slot, then<ol><li>Set <var>resValue</var> to <emu-val>undefined</emu-val>.</li></ol></li><li>Else if <var>resValue</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Set <var>resValue</var> to <var>resValue</var>.<var class="field">[[MessageValue]]</var>.</li></ol></li></ol></li><li>Perform ?&nbsp;CreateDataPropertyOrThrow(<var>options</var>, <var>optName</var>, <var>resValue</var>).</li></ol></li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"options"</emu-val>, <var>resOptions</var>).</li></ol></li><li>Let <var>funcArgs</var> be « <var>funcCtx</var>, <var>options</var>&nbsp;».</li><li>If Type(<var>resArg</var>) is Object and <var>resArg</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Set <var>resArg</var> to <var>resArg</var>.<var class="field">[[MessageValue]]</var>.</li></ol></li><li>If <var>resArg</var> is not <emu-val>undefined</emu-val>, then<ol><li>Append <var>resArg</var> to <var>funcArgs</var>.</li></ol></li><li>Let <var>funcRes</var> be Completion(Call(<var>function</var>, <emu-val>undefined</emu-val>, <var>funcArgs</var>)).</li><li>If <var>funcRes</var> is a normal completion, then<ol><li>Let <var>mv</var> be <var>funcRes</var>.<var class="field">[[Value]]</var>.</li><li>If Type(<var>mv</var>) is Object and Type(? Get(<var>mv</var>, <emu-val>"type"</emu-val>)) is String and Type(? Get(<var>mv</var>, <emu-val>"source"</emu-val>)) is String, then<ol><li>Let <var>result</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[MessageValue]]</var>&nbsp;»).</li><li>Set <var>result</var>.<var class="field">[[MessageValue]]</var> to <var>mv</var>.</li><li>Return <var>result</var>.</li></ol></li><li>Else,<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>TypeError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_45"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Return <emu-xref aoid="ResolveFallback" id="_ref_46"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_47"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>funcRes</var>).</li><li>Return <emu-xref aoid="ResolveFallback" id="_ref_48"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li></ol></emu-alg>
       </emu-clause>
 
       <emu-clause id="sec-resolveunknown" type="abstract operation" aoid="ResolveUnknown">
@@ -3369,16 +3385,16 @@ <h1><span class="secnum">1.5.5.2</span> ResolveUnknown ( <var>source</var>, <var
 
     <emu-clause id="sec-formatmarkuppart" type="abstract operation" aoid="FormatMarkupPart">
       <h1><span class="secnum">1.5.6</span> FormatMarkupPart ( <var>ctx</var>, <var>markup</var> )</h1>
-      <p>The abstract operation FormatMarkupPart takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_48"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>markup</var> (an Object) and returns an Object. It resolves the formatted part value of a markup placeholder. It performs the following steps when called:</p>
+      <p>The abstract operation FormatMarkupPart takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_49"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>markup</var> (an Object) and returns an Object. It resolves the formatted part value of a markup placeholder. It performs the following steps when called:</p>
 
-      <emu-alg><ol><li>Let <var>kind</var> be ?&nbsp;Get(<var>markup</var>, <emu-val>"kind"</emu-val>).</li><li>Let <var>name</var> be ?&nbsp;Get(<var>markup</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>options</var> be ?&nbsp;Get(<var>markup</var>, <emu-val>"options"</emu-val>).</li><li>Let <var>part</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"type"</emu-val>, <emu-val>"markup"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"kind"</emu-val>, <var>kind</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"name"</emu-val>, <var>name</var>).</li><li>If <var>kind</var> is not <emu-val>"close"</emu-val> and <var>options</var> is not <emu-val>undefined</emu-val>, then<ol><li>Let <var>len</var> be ?&nbsp;LengthOfArrayLike(<var>options</var>).</li><li>If <var>len</var> &gt; 0, then<ol><li>Let <var>opts</var> be ?&nbsp;CreateListFromArrayLike(<var>options</var>).</li><li>Let <var>resOptions</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>For each element <var>opt</var> of <var>opts</var>,<ol><li>Let <var>optName</var> be ?&nbsp;Get(<var>opt</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>optValue</var> be ?&nbsp;Get(<var>opt</var>, <emu-val>"value"</emu-val>).</li><li>Let <var>resValue</var> be <emu-xref aoid="ResolveValue" id="_ref_49"><a href="#sec-resolvevalue">ResolveValue</a></emu-xref>(<var>ctx</var>, <var>optValue</var>).</li><li>If Type(<var>resValue</var>) is Object, then<ol><li>If <var>resValue</var> has a <var class="field">[[MessageFallback]]</var> internal slot, then<ol><li>Set <var>resValue</var> to <emu-val>undefined</emu-val>.</li></ol></li><li>Else,<ol><li>Let <var>valueOf</var> be ?&nbsp;Get(<var>resValue</var>, <emu-val>"valueOf"</emu-val>).</li><li>If IsCallable(<var>valueOf</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>valueOfResult</var> be Completion(Call(<var>valueOf</var>, <var>resValue</var>)).</li><li>If <var>valueOfResult</var> is a normal completion, then<ol><li>Set <var>resValue</var> to <var>valueOfResult</var>.<var class="field">[[Value]]</var>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_50"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>valueOfResult</var>).</li><li>Set <var>resValue</var> to <emu-val>undefined</emu-val>.</li></ol></li></ol></li></ol></li></ol></li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>resOptions</var>, <var>optName</var>, <var>resValue</var>).</li></ol></li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"options"</emu-val>, <var>resOptions</var>).</li></ol></li></ol></li><li>Return CreateArrayFromList(« <var>part</var>&nbsp;»).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>kind</var> be ?&nbsp;Get(<var>markup</var>, <emu-val>"kind"</emu-val>).</li><li>Let <var>name</var> be ?&nbsp;Get(<var>markup</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>options</var> be ?&nbsp;Get(<var>markup</var>, <emu-val>"options"</emu-val>).</li><li>Let <var>part</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"type"</emu-val>, <emu-val>"markup"</emu-val>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"kind"</emu-val>, <var>kind</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"name"</emu-val>, <var>name</var>).</li><li>If <var>kind</var> is not <emu-val>"close"</emu-val> and <var>options</var> is not <emu-val>undefined</emu-val>, then<ol><li>Let <var>len</var> be ?&nbsp;LengthOfArrayLike(<var>options</var>).</li><li>If <var>len</var> &gt; 0, then<ol><li>Let <var>opts</var> be ?&nbsp;CreateListFromArrayLike(<var>options</var>).</li><li>Let <var>resOptions</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>For each element <var>opt</var> of <var>opts</var>,<ol><li>Let <var>optName</var> be ?&nbsp;Get(<var>opt</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>optValue</var> be ?&nbsp;Get(<var>opt</var>, <emu-val>"value"</emu-val>).</li><li>Let <var>resValue</var> be <emu-xref aoid="ResolveValue" id="_ref_50"><a href="#sec-resolvevalue">ResolveValue</a></emu-xref>(<var>ctx</var>, <var>optValue</var>).</li><li>If Type(<var>resValue</var>) is Object, then<ol><li>If <var>resValue</var> has a <var class="field">[[MessageFallback]]</var> internal slot, then<ol><li>Set <var>resValue</var> to <emu-val>undefined</emu-val>.</li></ol></li><li>Else,<ol><li>Let <var>valueOf</var> be ?&nbsp;Get(<var>resValue</var>, <emu-val>"valueOf"</emu-val>).</li><li>If IsCallable(<var>valueOf</var>) is <emu-val>true</emu-val>, then<ol><li>Let <var>valueOfResult</var> be Completion(Call(<var>valueOf</var>, <var>resValue</var>)).</li><li>If <var>valueOfResult</var> is a normal completion, then<ol><li>Set <var>resValue</var> to <var>valueOfResult</var>.<var class="field">[[Value]]</var>.</li></ol></li><li>Else,<ol><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_51"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>valueOfResult</var>).</li><li>Set <var>resValue</var> to <emu-val>undefined</emu-val>.</li></ol></li></ol></li></ol></li></ol></li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>resOptions</var>, <var>optName</var>, <var>resValue</var>).</li></ol></li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>part</var>, <emu-val>"options"</emu-val>, <var>resOptions</var>).</li></ol></li></ol></li><li>Return CreateArrayFromList(« <var>part</var>&nbsp;»).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-getsource" type="abstract operation" aoid="GetSource">
       <h1><span class="secnum">1.5.7</span> GetSource ( <var>ctx</var>, <var>value</var> )</h1>
-      <p>The abstract operation GetSource takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_51"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>value</var> (an Object) and returns a String. Determines the "source" value for a data model Object. It performs the following steps when called:</p>
+      <p>The abstract operation GetSource takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_52"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>value</var> (an Object) and returns a String. Determines the "source" value for a data model Object. It performs the following steps when called:</p>
 
-      <emu-alg><ol><li>Let <var>type</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"type"</emu-val>).</li><li>If <var>type</var> is <emu-val>"literal"</emu-val>, then<ol><li>Let <var>strValue</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"value"</emu-val>).</li><li>Modify <var>strValue</var> such that all <emu-val>"\"</emu-val> characters are replaced with <emu-val>"\"</emu-val>.</li><li>Modify <var>strValue</var> such that all <emu-val>"|"</emu-val> characters are replaced with <emu-val>"|"</emu-val>.</li><li>Return the string-concatenation of <emu-val>"|"</emu-val>, <var>strValue</var>, and <emu-val>"|"</emu-val>.</li></ol></li><li>If <var>type</var> is <emu-val>"variable"</emu-val>, then<ol><li>Let <var>name</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>local</var> be !&nbsp;Get(<var>ctx</var>.<var class="field">[[LocalVariables]]</var>, <var>name</var>).</li><li>If Type(<var>local</var>) is Object, then<ol><li>If <var>local</var> has an <var class="field">[[UnresolvedDeclaration]]</var> internal slot, then<ol><li>Let <var>decl</var> be <var>local</var>.<var class="field">[[UnresolvedDeclaration]]</var>.</li><li>If ?&nbsp;Get(<var>decl</var>, <emu-val>"type"</emu-val>) is <emu-val>"local"</emu-val>, then<ol><li>Let <var>declValue</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"value"</emu-val>).</li><li>Return ?&nbsp;<emu-xref aoid="GetSource" id="_ref_52"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>ctx</var>, <var>declValue</var>).</li></ol></li></ol></li><li>Else if <var>local</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Return <emu-xref aoid="MessageValueSource" id="_ref_53"><a href="#sec-messagevaluesource">MessageValueSource</a></emu-xref>(<var>local</var>.<var class="field">[[MessageValue]]</var>).</li></ol></li><li>Else,<ol><li>Assert: <var>local</var> has a <var class="field">[[ResolvedName]]</var> internal slot.</li><li>Assert: <var>local</var> has a <var class="field">[[ResolvedValue]]</var> internal slot.</li><li>Set <var>name</var> to <var>local</var>.<var class="field">[[ResolvedName]]</var>.</li></ol></li></ol></li><li>Return the string-concatenation of <emu-val>"$"</emu-val> and <var>name</var>.</li></ol></li><li>If <var>type</var> is <emu-val>"markup"</emu-val>, then<ol><li>Let <var>kind</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"kind"</emu-val>).</li><li>Let <var>name</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"name"</emu-val>).</li><li>If <var>kind</var> is <emu-val>"open"</emu-val>, return the string-concatenation of <emu-val>"#"</emu-val> and <var>name</var>.</li><li>If <var>kind</var> is <emu-val>"standalone"</emu-val>, return the string-concatenation of <emu-val>"#"</emu-val>, <var>name</var>, and <emu-val>"/"</emu-val>.</li><li>If <var>kind</var> is <emu-val>"close"</emu-val>, return the string-concatenation of <emu-val>"/"</emu-val> and <var>name</var>.</li></ol></li><li>If <var>type</var> is <emu-val>"function"</emu-val>, then<ol><li>Let <var>name</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"name"</emu-val>).</li><li>Return the string-concatenation of <emu-val>":"</emu-val> and <var>name</var>.</li></ol></li><li>If <var>type</var> is <emu-val>"unsupported-annotation"</emu-val>, then<ol><li>Return ?&nbsp;Get(<var>value</var>, <emu-val>"sigil"</emu-val>).</li></ol></li><li>If <var>type</var> is <emu-val>"expression"</emu-val>, then<ol><li>Let <var>arg</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"arg"</emu-val>).</li><li>If <var>arg</var> is not <emu-val>undefined</emu-val>, return ?&nbsp;<emu-xref aoid="GetSource" id="_ref_54"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>ctx</var>, <var>arg</var>).</li><li>Let <var>annotation</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"annotation"</emu-val>).</li><li>If <var>annotation</var> is not <emu-val>undefined</emu-val>, return ?&nbsp;<emu-xref aoid="GetSource" id="_ref_55"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>ctx</var>, <var>annotation</var>).</li></ol></li><li>Return <emu-val>"\uFFFD"</emu-val>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>type</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"type"</emu-val>).</li><li>If <var>type</var> is <emu-val>"literal"</emu-val>, then<ol><li>Let <var>strValue</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"value"</emu-val>).</li><li>Modify <var>strValue</var> such that all <emu-val>"\"</emu-val> characters are replaced with <emu-val>"\"</emu-val>.</li><li>Modify <var>strValue</var> such that all <emu-val>"|"</emu-val> characters are replaced with <emu-val>"|"</emu-val>.</li><li>Return the string-concatenation of <emu-val>"|"</emu-val>, <var>strValue</var>, and <emu-val>"|"</emu-val>.</li></ol></li><li>If <var>type</var> is <emu-val>"variable"</emu-val>, then<ol><li>Let <var>name</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>local</var> be !&nbsp;Get(<var>ctx</var>.<var class="field">[[LocalVariables]]</var>, <var>name</var>).</li><li>If Type(<var>local</var>) is Object, then<ol><li>If <var>local</var> has an <var class="field">[[UnresolvedDeclaration]]</var> internal slot, then<ol><li>Let <var>decl</var> be <var>local</var>.<var class="field">[[UnresolvedDeclaration]]</var>.</li><li>If ?&nbsp;Get(<var>decl</var>, <emu-val>"type"</emu-val>) is <emu-val>"local"</emu-val>, then<ol><li>Let <var>declValue</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"value"</emu-val>).</li><li>Return ?&nbsp;<emu-xref aoid="GetSource" id="_ref_53"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>ctx</var>, <var>declValue</var>).</li></ol></li></ol></li><li>Else if <var>local</var> has a <var class="field">[[MessageValue]]</var> internal slot, then<ol><li>Return <emu-xref aoid="MessageValueSource" id="_ref_54"><a href="#sec-messagevaluesource">MessageValueSource</a></emu-xref>(<var>local</var>.<var class="field">[[MessageValue]]</var>).</li></ol></li><li>Else,<ol><li>Assert: <var>local</var> has a <var class="field">[[ResolvedName]]</var> internal slot.</li><li>Assert: <var>local</var> has a <var class="field">[[ResolvedValue]]</var> internal slot.</li><li>Set <var>name</var> to <var>local</var>.<var class="field">[[ResolvedName]]</var>.</li></ol></li></ol></li><li>Return the string-concatenation of <emu-val>"$"</emu-val> and <var>name</var>.</li></ol></li><li>If <var>type</var> is <emu-val>"markup"</emu-val>, then<ol><li>Let <var>kind</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"kind"</emu-val>).</li><li>Let <var>name</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"name"</emu-val>).</li><li>If <var>kind</var> is <emu-val>"open"</emu-val>, return the string-concatenation of <emu-val>"#"</emu-val> and <var>name</var>.</li><li>If <var>kind</var> is <emu-val>"standalone"</emu-val>, return the string-concatenation of <emu-val>"#"</emu-val>, <var>name</var>, and <emu-val>"/"</emu-val>.</li><li>If <var>kind</var> is <emu-val>"close"</emu-val>, return the string-concatenation of <emu-val>"/"</emu-val> and <var>name</var>.</li></ol></li><li>If <var>type</var> is <emu-val>"function"</emu-val>, then<ol><li>Let <var>name</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"name"</emu-val>).</li><li>Return the string-concatenation of <emu-val>":"</emu-val> and <var>name</var>.</li></ol></li><li>If <var>type</var> is <emu-val>"unsupported-annotation"</emu-val>, then<ol><li>Return ?&nbsp;Get(<var>value</var>, <emu-val>"sigil"</emu-val>).</li></ol></li><li>If <var>type</var> is <emu-val>"expression"</emu-val>, then<ol><li>Let <var>arg</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"arg"</emu-val>).</li><li>If <var>arg</var> is not <emu-val>undefined</emu-val>, return ?&nbsp;<emu-xref aoid="GetSource" id="_ref_55"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>ctx</var>, <var>arg</var>).</li><li>Let <var>annotation</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"annotation"</emu-val>).</li><li>If <var>annotation</var> is not <emu-val>undefined</emu-val>, return ?&nbsp;<emu-xref aoid="GetSource" id="_ref_56"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>ctx</var>, <var>annotation</var>).</li></ol></li><li>Return <emu-val>"\uFFFD"</emu-val>.</li></ol></emu-alg>
 
       <emu-clause id="sec-messagevaluesource" type="abstract operation" aoid="MessageValueSource">
         <h1><span class="secnum">1.5.7.1</span> MessageValueSource ( <var>mv</var> )</h1>
@@ -3394,7 +3410,7 @@ <h1><span class="secnum">1.5.7.1</span> MessageValueSource ( <var>mv</var> )</h1
 
     <emu-clause id="sec-handlemessageformaterror" type="abstract operation" aoid="HandleMessageFormatError">
       <h1><span class="secnum">1.5.8</span> HandleMessageFormatError ( <var>ctx</var>, <var>completionRecord</var> )</h1>
-      <p>The abstract operation HandleMessageFormatError takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_56"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>completionRecord</var> (a Completion Record). It handles errors during formatting. It performs the following steps when called:</p>
+      <p>The abstract operation HandleMessageFormatError takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_57"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>completionRecord</var> (a Completion Record). It handles errors during formatting. It performs the following steps when called:</p>
 
       <emu-alg><ol><li>Assert: <var>completionRecord</var> is a Completion Record.</li><li>Assert: <var>completionRecord</var> is an abrupt completion.</li><li>Let <var>onError</var> be <var>ctx</var>.<var class="field">[[OnError]]</var>.</li><li>Let <var>error</var> be <var>completionRecord</var>.<var class="field">[[Value]]</var>.</li><li>If <var>onError</var> is not <emu-val>undefined</emu-val>, then<ol><li>Perform ?&nbsp;Call(<var>onError</var>, <emu-val>undefined</emu-val>, « <var>error</var> »).</li></ol></li><li>Else if an appropriate notification mechanism exists, then<ol><li>Issue a warning for <var>error</var>.</li></ol></li></ol></emu-alg>
     </emu-clause>
@@ -3403,7 +3419,7 @@ <h1><span class="secnum">1.5.8</span> HandleMessageFormatError ( <var>ctx</var>,
       <h1><span class="secnum">1.5.9</span> ResolveFallback ( <var>source</var> )</h1>
       <p>The abstract operation ResolveFallback takes argument <var>source</var> (a String) and returns an Object with internal slots <var class="field">[[MessageFallback]]</var> and <var class="field">[[MessageValue]]</var>. It resolves a fallback value. It performs the following steps when called:</p>
 
-      <emu-alg><ol><li>Let <var>toPartsClosure</var> be a new Abstract Closure with no parameters that captures <var>source</var> and performs the following steps when called:<ol><li>Let <var>part</var> be <emu-xref aoid="MessageFallbackPart" id="_ref_57"><a href="#sec-messagefallbackpart">MessageFallbackPart</a></emu-xref>(<var>source</var>).</li><li>Return CreateArrayFromList(« <var>part</var>&nbsp;»).</li></ol></li><li>Let <var>toParts</var> be CreateBuiltinFunction(<var>toPartsClosure</var>, <emu-val>0</emu-val>, <emu-val>"toParts"</emu-val>, «&nbsp;»).</li><li>Let <var>toStringClosure</var> be a new Abstract Closure with no parameters that captures <var>source</var> and performs the following steps when called:<ol><li>Return <emu-xref aoid="MessageFallbackString" id="_ref_58"><a href="#sec-messagefallbackstring">MessageFallbackString</a></emu-xref>(<var>source</var>).</li></ol></li><li>Let <var>toString</var> be CreateBuiltinFunction(<var>toStringClosure</var>, <emu-val>0</emu-val>, <emu-val>"toString"</emu-val>, «&nbsp;»).</li><li>Let <var>mv</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toParts"</emu-val>, <var>toParts</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toString"</emu-val>, <var>toString</var>).</li><li>Let <var>fallback</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[MessageFallback]]</var>, <var class="field">[[MessageValue]]</var>&nbsp;»).</li><li>Set <var>fallback</var>.<var class="field">[[MessageValue]]</var> to <var>mv</var>.</li><li>Return <var>fallback</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>toPartsClosure</var> be a new Abstract Closure with no parameters that captures <var>source</var> and performs the following steps when called:<ol><li>Let <var>part</var> be <emu-xref aoid="MessageFallbackPart" id="_ref_58"><a href="#sec-messagefallbackpart">MessageFallbackPart</a></emu-xref>(<var>source</var>).</li><li>Return CreateArrayFromList(« <var>part</var>&nbsp;»).</li></ol></li><li>Let <var>toParts</var> be CreateBuiltinFunction(<var>toPartsClosure</var>, <emu-val>0</emu-val>, <emu-val>"toParts"</emu-val>, «&nbsp;»).</li><li>Let <var>toStringClosure</var> be a new Abstract Closure with no parameters that captures <var>source</var> and performs the following steps when called:<ol><li>Return <emu-xref aoid="MessageFallbackString" id="_ref_59"><a href="#sec-messagefallbackstring">MessageFallbackString</a></emu-xref>(<var>source</var>).</li></ol></li><li>Let <var>toString</var> be CreateBuiltinFunction(<var>toStringClosure</var>, <emu-val>0</emu-val>, <emu-val>"toString"</emu-val>, «&nbsp;»).</li><li>Let <var>mv</var> be OrdinaryObjectCreate(%Object.prototype%).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"source"</emu-val>, <var>source</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toParts"</emu-val>, <var>toParts</var>).</li><li>Perform !&nbsp;CreateDataPropertyOrThrow(<var>mv</var>, <emu-val>"toString"</emu-val>, <var>toString</var>).</li><li>Let <var>fallback</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[MessageFallback]]</var>, <var class="field">[[MessageValue]]</var>&nbsp;»).</li><li>Set <var>fallback</var>.<var class="field">[[MessageValue]]</var> to <var>mv</var>.</li><li>Return <var>fallback</var>.</li></ol></emu-alg>
 
       <emu-clause id="sec-messagefallbackpart" type="abstract operation" aoid="MessageFallbackPart">
         <h1><span class="secnum">1.5.9.1</span> MessageFallbackPart ( <var>source</var> )</h1>
@@ -3422,14 +3438,14 @@ <h1><span class="secnum">1.5.9.2</span> MessageFallbackString ( <var>source</var
 
     <emu-clause id="sec-resolvevalue" type="abstract operation" aoid="ResolveValue">
       <h1><span class="secnum">1.5.10</span> ResolveValue ( <var>ctx</var>, <var>value</var> )</h1>
-      <p>The abstract operation ResolveValue takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_59"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>value</var> (an Object) and returns an ECMAScript language value. 
+      <p>The abstract operation ResolveValue takes arguments <var>ctx</var> (a <emu-xref href="#messageformatcontext-record" id="_ref_60"><a href="#messageformatcontext-record">MessageFormatContext Record</a></emu-xref>) and <var>value</var> (an Object) and returns an ECMAScript language value. 
           It resolves the value of a literal or variable reference.
           For literals, the returned value is always a String.
           For variable references, the returned value may be any ECMAScript language value.
           For unresolved variable references, the returned value is an Object with an internal slot <var class="field">[[MessageFallback]]</var>.
          It performs the following steps when called:</p>
 
-      <emu-alg><ol><li>Let <var>type</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"type"</emu-val>).</li><li>If <var>type</var> is <emu-val>"literal"</emu-val>, then<ol><li>Return ?&nbsp;Get(<var>value</var>, <emu-val>"value"</emu-val>).</li></ol></li><li>Assert: <var>type</var> is <emu-val>"variable"</emu-val>.</li><li>Let <var>name</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>localVars</var> be <var>ctx</var>.<var class="field">[[LocalVariables]]</var>.</li><li>Let <var>var</var> be !&nbsp;Get(<var>localVars</var>, <var>name</var>).</li><li>If <var>var</var> is <emu-val>undefined</emu-val>, then<ol><li>Set <var>var</var> to ?&nbsp;Get(<var>ctx</var>.<var class="field">[[Values]]</var>, <var>name</var>).</li><li>If <var>var</var> is <emu-val>undefined</emu-val>, then<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>ReferenceError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_60"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Let <var>source</var> be ?&nbsp;<emu-xref aoid="GetSource" id="_ref_61"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>value</var>).</li><li>Set <var>var</var> to <emu-xref aoid="ResolveFallback" id="_ref_62"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li><li>Perform !&nbsp;Set(<var>localVars</var>, <var>name</var>, <var>var</var>).</li></ol></li><li>Else,<ol><li>Let <var>resolved</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[ResolvedName]]</var>, <var class="field">[[ResolvedValue]]</var>&nbsp;»).</li><li>Set <var>resolved</var>.<var class="field">[[ResolvedName]]</var> to <var>name</var>.</li><li>Set <var>resolved</var>.<var class="field">[[ResolvedValue]]</var> to <var>var</var>.</li><li>Perform !&nbsp;Set(<var>localVars</var>, <var>name</var>, <var>resolved</var>).</li></ol></li></ol></li><li>Else,<ol><li>Assert: Type(<var>var</var>) is Object.</li><li>If <var>var</var> has a <var class="field">[[ResolvedValue]]</var> internal slot, then<ol><li>Set <var>var</var> to <var>var</var>.<var class="field">[[ResolvedValue]]</var>.</li></ol></li><li>Else if <var>var</var> has an <var class="field">[[UnresolvedDeclaration]]</var> internal slot, then<ol><li>Let <var>decl</var> be <var>var</var>.<var class="field">[[UnresolvedDeclaration]]</var>.</li><li>Let <var>declType</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"type"</emu-val>).</li><li>If <var>declType</var> is <emu-val>"input"</emu-val>, then<ol><li>Let <var>expression</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"value"</emu-val>).</li><li>Perform !&nbsp;Set(<var>localVars</var>, <var>name</var>, <emu-val>undefined</emu-val>).</li><li>Set <var>var</var> to ?&nbsp;<emu-xref aoid="ResolveExpression" id="_ref_63"><a href="#sec-resolveexpression">ResolveExpression</a></emu-xref>(<var>ctx</var>, <var>expression</var>).</li></ol></li><li>Else if <var>declType</var> is <emu-val>"local"</emu-val>, then<ol><li>Let <var>expression</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"value"</emu-val>).</li><li>Set <var>var</var> to ?&nbsp;<emu-xref aoid="ResolveExpression" id="_ref_64"><a href="#sec-resolveexpression">ResolveExpression</a></emu-xref>(<var>ctx</var>, <var>expression</var>).</li></ol></li><li>Else,<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>ReferenceError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_65"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Let <var>source</var> be ?&nbsp;<emu-xref aoid="GetSource" id="_ref_66"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>value</var>).</li><li>Set <var>var</var> to <emu-xref aoid="ResolveFallback" id="_ref_67"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li><li>Perform !&nbsp;Set(<var>localVars</var>, <var>name</var>, <var>var</var>).</li></ol></li></ol></li><li>Return <var>var</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>type</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"type"</emu-val>).</li><li>If <var>type</var> is <emu-val>"literal"</emu-val>, then<ol><li>Return ?&nbsp;Get(<var>value</var>, <emu-val>"value"</emu-val>).</li></ol></li><li>Assert: <var>type</var> is <emu-val>"variable"</emu-val>.</li><li>Let <var>name</var> be ?&nbsp;Get(<var>value</var>, <emu-val>"name"</emu-val>).</li><li>Let <var>localVars</var> be <var>ctx</var>.<var class="field">[[LocalVariables]]</var>.</li><li>Let <var>var</var> be !&nbsp;Get(<var>localVars</var>, <var>name</var>).</li><li>If <var>var</var> is <emu-val>undefined</emu-val>, then<ol><li>Set <var>var</var> to ?&nbsp;Get(<var>ctx</var>.<var class="field">[[Values]]</var>, <var>name</var>).</li><li>If <var>var</var> is <emu-val>undefined</emu-val>, then<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>ReferenceError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_61"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Let <var>source</var> be ?&nbsp;<emu-xref aoid="GetSource" id="_ref_62"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>value</var>).</li><li>Set <var>var</var> to <emu-xref aoid="ResolveFallback" id="_ref_63"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li><li>Perform !&nbsp;Set(<var>localVars</var>, <var>name</var>, <var>var</var>).</li></ol></li><li>Else,<ol><li>Let <var>resolved</var> be OrdinaryObjectCreate(<emu-val>null</emu-val>, « <var class="field">[[ResolvedName]]</var>, <var class="field">[[ResolvedValue]]</var>&nbsp;»).</li><li>Set <var>resolved</var>.<var class="field">[[ResolvedName]]</var> to <var>name</var>.</li><li>Set <var>resolved</var>.<var class="field">[[ResolvedValue]]</var> to <var>var</var>.</li><li>Perform !&nbsp;Set(<var>localVars</var>, <var>name</var>, <var>resolved</var>).</li></ol></li></ol></li><li>Else,<ol><li>Assert: Type(<var>var</var>) is Object.</li><li>If <var>var</var> has a <var class="field">[[ResolvedValue]]</var> internal slot, then<ol><li>Set <var>var</var> to <var>var</var>.<var class="field">[[ResolvedValue]]</var>.</li></ol></li><li>Else if <var>var</var> has an <var class="field">[[UnresolvedDeclaration]]</var> internal slot, then<ol><li>Let <var>decl</var> be <var>var</var>.<var class="field">[[UnresolvedDeclaration]]</var>.</li><li>Let <var>declType</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"type"</emu-val>).</li><li>If <var>declType</var> is <emu-val>"input"</emu-val>, then<ol><li>Let <var>expression</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"value"</emu-val>).</li><li>Perform !&nbsp;Set(<var>localVars</var>, <var>name</var>, <emu-val>undefined</emu-val>).</li><li>Set <var>var</var> to ?&nbsp;<emu-xref aoid="ResolveExpression" id="_ref_64"><a href="#sec-resolveexpression">ResolveExpression</a></emu-xref>(<var>ctx</var>, <var>expression</var>).</li></ol></li><li>Else if <var>declType</var> is <emu-val>"local"</emu-val>, then<ol><li>Let <var>expression</var> be ?&nbsp;Get(<var>decl</var>, <emu-val>"value"</emu-val>).</li><li>Set <var>var</var> to ?&nbsp;<emu-xref aoid="ResolveExpression" id="_ref_65"><a href="#sec-resolveexpression">ResolveExpression</a></emu-xref>(<var>ctx</var>, <var>expression</var>).</li></ol></li><li>Else,<ol><li>Let <var>error</var> be ThrowCompletion(<emu-val>ReferenceError</emu-val>).</li><li>Perform ?&nbsp;<emu-xref aoid="HandleMessageFormatError" id="_ref_66"><a href="#sec-handlemessageformaterror">HandleMessageFormatError</a></emu-xref>(<var>ctx</var>, <var>error</var>).</li><li>Let <var>source</var> be ?&nbsp;<emu-xref aoid="GetSource" id="_ref_67"><a href="#sec-getsource">GetSource</a></emu-xref>(<var>value</var>).</li><li>Set <var>var</var> to <emu-xref aoid="ResolveFallback" id="_ref_68"><a href="#sec-resolvefallback">ResolveFallback</a></emu-xref>(<var>source</var>).</li></ol></li><li>Perform !&nbsp;Set(<var>localVars</var>, <var>name</var>, <var>var</var>).</li></ol></li></ol></li><li>Return <var>var</var>.</li></ol></emu-alg>
     </emu-clause>
   </emu-clause>
 </emu-clause><emu-annex id="sec-copyright-and-software-license">
diff --git a/spec.emu b/spec.emu
index e3e4b83..22b2e74 100644
--- a/spec.emu
+++ b/spec.emu
@@ -326,9 +326,12 @@ contributors: Eemeli Aro
         1. Let _number_ be CreateBuiltinFunction(_numberSteps_, *3*, *"number"*, « »).
         1. Let _stringSteps_ be the algorithm steps defined in <emu-xref href="#sec-messageformat-stringfunctions"></emu-xref>.
         1. Let _string_ be CreateBuiltinFunction(_stringSteps_, *3*, *"string"*, « »).
+        1. Let _dateTimeSteps_ be the algorithm steps defined in <emu-xref href="#sec-messageformat-stringfunctions"></emu-xref>.
+        1. Let _dateTime_ be CreateBuiltinFunction(_dateTimeSteps_, *3*, *"string"*, « »).
         1. Let _functions_ be OrdinaryObjectCreate(%Object.prototype%).
         1. Perform ! CreateDataPropertyOrThrow(_functions_, *"number"*, _number_).
         1. Perform ! CreateDataPropertyOrThrow(_functions_, *"string"*, _string_).
+        1. Perform ! CreateDataPropertyOrThrow(_functions_, *"datetime"*, _dateTime_).
         1. For each String _name_ of ? EnumerableOwnProperties(_userFunctions_, ~key~),
            1. Let _func_ be ? Get(_userFunctions_, _name_).
            1. If IsCallable(_func_) is *true*, then
@@ -366,11 +369,12 @@ contributors: Eemeli Aro
           1. Let _booleanOptions_ be « *"useGrouping"* ».
           1. Let _select_ be *"cardinal"*.
           1. For each String _optName_ of ? EnumerableOwnProperties(_options_, ~key~),
-             1. If _optName_ is not *"localeMatcher"* and _optName_ is not *"type"*, then
+             1. If _optName_ is not *"localeMatcher"* and _optName_ is not *"type"*, then <!-- TODO: Fix bad indent -->
+                1. Let _optValue_ be ? Get(_options_, _optName_).
                 1. If Type(_optValue_) is Object, then
                    1. Let _optValueOf_ be ? Get(_optValue_, *"valueOf"*).
                    1. If IsCallable(_optValueOf_) is *true*, then
-                      1. Set _optValue__ to ? Call(_optValueOf_, _optValue_).
+                      1. Set _optValue_ to ? Call(_optValueOf_, _optValue_).
                 1. If _optName_ is *"select"*, then
                    1. If _optValue_ is *"ordinal"* or _optValue_ is *"exact"*, then
                       1. Set _select_ to _optValue_
@@ -403,7 +407,7 @@ contributors: Eemeli Aro
              1. Return *null*.
           1. Let _selectKey_ be CreateBuiltinFunction(_selectKeyClosure_, *1*, *"selectKey"*, « »).
           1. Let _toPartsClosure_ be a new Abstract Closure with no parameters that captures _input_, _source_, and _numberFormat_ and performs the following steps when called:
-             1. Let _parts_ be ? Call(Intl.NumberFormat.prototype.formatToParts, _nf_, « _input_ »).
+             1. Let _parts_ be ? Call(Intl.NumberFormat.prototype.formatToParts, _numberFormat_, « _input_ »).
              1. Let _result_ be OrdinaryObjectCreate(%Object.prototype%).
              1. Perform ! CreateDataPropertyOrThrow(_result_, *"type"*, *"number"*).
              1. Perform ! CreateDataPropertyOrThrow(_result_, *"source"*, _source_).
@@ -412,7 +416,7 @@ contributors: Eemeli Aro
              1. Return CreateArrayFromList(« _result_ »).
           1. Let _toParts_ be CreateBuiltinFunction(_toPartsClosure_, *0*, *"toParts"*, « »).
           1. Let _toStringClosure_ be a new Abstract Closure with no parameters that captures _input_ and _numberFormat_ and performs the following steps when called:
-             1. Return ? Call(Intl.NumberFormat.prototype.format, _nf_, « _input_ »).
+             1. Return ? Call(Intl.NumberFormat.prototype.format, _numberFormat_, « _input_ »).
           1. Let _toString_ be CreateBuiltinFunction(_toStringClosure_, *0*, *"toString"*, « »).
           1. Let _valueOfClosure_ be a new Abstract Closure with no parameters that captures _input_ and performs the following steps when called:
              1. Return _input_.
@@ -481,6 +485,77 @@ contributors: Eemeli Aro
           The *"length"* property of a MessageFormat string function is *3*.
         </p>
       </emu-clause>
+
+      <emu-clause id="sec-messageformat-datetimefunctions">
+        <h1>MessageFormat DateTime Functions</h1>
+        <p>
+          A MessageFormat dateTime function is an anonymous built-in function.
+        </p>
+        <p>
+          When a MessageFormat dateTime function is called with arguments _funcCtx_ (an Object), _options_ (an Object), and _input_ (an ECMAScript language value), the following steps are taken:
+        </p>
+
+        <emu-alg>
+          1. Let _locale_ be ! Get(_funcCtx_, *"locale"*).
+          1. Let _localeMatcher_ be ! Get(_funcCtx_, *"localeMatcher"*).
+          1. Let _source_ be ! Get(_funcCtx_, *"source"*).
+          1. Let _opts_ be OrdinaryObjectCreate(%Object.prototype%).
+          1. Perform ! CreateDataPropertyOrThrow(_opt_, *"localeMatcher"*, _localeMatcher_).
+          1. If Type(_input_) is Object, then
+            1. If HasProperty(_input_, *"options"*) is *true*, then
+              1. Let _inputOptions_ be ? Get(_input_, *"options"*).
+              1. Perform ? Call(Object.assign, *undefined*, « _opts_, _inputOptions_ »).
+            1. Let _valueOf_ be ? Get(_input_, *"valueOf"*).
+            1. If InstanceOfOperator(_input_, %Date%) is *false* and IsCallable(_valueOf_) is *true*, set _input_ to Call(_valueOf_, _input_).
+          1. If Type(_input_) is Number or String, let _value_ be ? Construct(%Date%, « _input_ »).
+          1. Else if Type(_input_) is Object, let _value_ be _input_.
+          1. If InstanceOfOperator(_value_, %Date%) is *false*, throw a *TypeError* exception.
+          1. For each String _optName_ of ? EnumerableOwnProperties(_options_, ~key~),
+            1. If _optName_ is not *"locale"*, then
+              1. Let _optValue_ be ? Get(_options_, _optName_).
+              1. If Type(_optValue_) is Object, then
+                  1. Let _optValueOf_ be ? Get(_optValue_, *"valueOf"*).
+                  1. If IsCallable(_optValueOf_) is *true*, then
+                    1. Set _optValue__ to ? Call(_optValueOf_, _optValue_).
+              1. If _optName_ is *"fractionalSecondDigits"*, set _optValue_ to ToNumber(_optValue_).
+              1. Else if _optName_ is *"hour12"*, then
+                1. If _optValue_ is *"true"*, then
+                  1. Set _optValue_ to *true*.
+                1. Else if _optValue_ is *"false"*, then
+                  1. Set _optValue_ to *false*.
+              1. Else, set _optValue_ to ToString(_optValue_).
+              1. Perform ? Set(_opts_, _optName_, _optValue_, *"true"*).
+          1. Let _dateTimeFormat_ be ? Construct(%Intl.DateTimeFormat%, « _locale_, _opts_ »).
+          1. Let _toPartsClosure_ be a new Abstract Closure with no parameters that captures _value_, _source_, and _dateTimeFormat_ and performs the following steps when called:
+            1. Let _parts_ be ? Call(Intl.DateTimeFormat.prototype.formatToParts, _dateTimeFormat_, « _value_ »).
+            1. Let _result_ be OrdinaryObjectCreate(%Object.prototype%).
+            1. Perform ! CreateDataPropertyOrThrow(_result_, *"type"*, *"datetime"*).
+            1. Perform ! CreateDataPropertyOrThrow(_result_, *"source"*, _source_).
+            1. Perform ! CreateDataPropertyOrThrow(_result_, *"locale"*, _dateTimeFormat_.[[Locale]]).
+            1. Perform ! CreateDataPropertyOrThrow(_result_, *"parts"*, _parts_).
+            1. Return CreateArrayFromList(« _result_ »).
+          1. Let _toParts_ be CreateBuiltinFunction(_toPartsClosure_, *0*, *"toParts"*, « »).
+          1. Let _toStringClosure_ be a new Abstract Closure with no parameters that captures _value_ and _dateTimeFormat_ and performs the following steps when called:
+             1. Return ? Call(Intl.DateTimeFormat.prototype.format, _dateTimeFormat_, « _value_ »).
+          1. Let _toString_ be CreateBuiltinFunction(_toStringClosure_, *0*, *"toString"*, « »).
+          1. Let _valueOfClosure_ be a new Abstract Closure with no parameters that captures _value_ and performs the following steps when called:
+             1. Return _value_.
+          1. Let _valueOf_ be CreateBuiltinFunction(_valueOfClosure_, *0*, *"valueOf"*, « »).
+          1. Let _mv_ be OrdinaryObjectCreate(%Object.prototype%).
+          1. Perform ! CreateDataPropertyOrThrow(_mv_, *"type"*, *"datetime"*).
+          1. Perform ! CreateDataPropertyOrThrow(_mv_, *"source"*, _source_).
+          1. Perform ! CreateDataPropertyOrThrow(_mv_, *"locale"*, _dateTimeFormat_.[[Locale]]).
+          1. Perform ! CreateDataPropertyOrThrow(_mv_, *"options"*, _opts_).
+          1. Perform ! CreateDataPropertyOrThrow(_mv_, *"toParts"*, _toParts_).
+          1. Perform ! CreateDataPropertyOrThrow(_mv_, *"toString"*, _toString_).
+          1. Perform ! CreateDataPropertyOrThrow(_mv_, *"valueOf"*, _valueOf_).
+          1. Return _mv_.
+        </emu-alg>
+
+        <p>
+          The *"length"* property of a MessageFormat number function is *3*.
+        </p>
+      </emu-clause>
     </emu-clause>
 
     <emu-clause id="sec-createmessageformatcontext" type="abstract operation">