Drop extension to ToString

spec.emu

@@ -20,41 +20,6 @@ location: https://github.com/tc39/proposal-decimal/
   </ul>
 </emu-intro>
 
-<emu-clause id="sec-abstract-operations">
-  <h1>Abstract Operations</h1>
-
-  <emu-clause id="sec-type-conversion">
-    <h1>Type Conversion</h1>
-
-    <emu-clause id="sec-tostring" type="abstract operation">
-      <h1>
-        ToString (
-          _argument_: an ECMAScript language value,
-        ): either a normal completion containing a String or a throw completion
-      </h1>
-      <dl class="header">
-        <dt>description</dt>
-        <dd>It converts _argument_ to a value of type String.</dd>
-      </dl>
-      <emu-alg>
-        1. If _argument_ is a String, return _argument_.
-        1. If _argument_ is a Symbol, throw a *TypeError* exception.
-        1. If _argument_ is *undefined*, return *"undefined"*.
-        1. If _argument_ is *null*, return *"null"*.
-        1. If _argument_ is *true*, return *"true"*.
-        1. If _argument_ is *false*, return *"false"*.
-        1. If _argument_ is a Number, return Number::toString(_argument_, 10).
-        1. If _argument_ is a BigInt, return BigInt::toString(_argument_, 10).
-        1. Assert: _argument_ is an Object.
-        1. <ins>If _argument_ has a [[Decimal128Data]] internal slot, return Decimal128ToDecimalString(_argument_.[[Decimal128Data]]).</ins>
-        1. Let _primValue_ be ? ToPrimitive(_argument_, ~string~).
-        1. Assert: _primValue_ is not an Object.
-        1. Return ? ToString(_primValue_).
-      </emu-alg>
-    </emu-clause>
-  </emu-clause>
-</emu-clause>
-
 <emu-clause id="sec-the-decimal-object">
   <h1>The Decimal128 Object</h1>