diff --git a/package.json b/package.json
index 3f4e713..68c6c31 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "zeed",
   "type": "module",
-  "version": "0.20.3",
+  "version": "0.20.4",
   "description": "🌱 Simple foundation library",
   "author": {
     "name": "Dirk Holtwick",
diff --git a/src/common/data/object.spec.ts b/src/common/data/object.spec.ts
index 4df183c..687a5d0 100644
--- a/src/common/data/object.spec.ts
+++ b/src/common/data/object.spec.ts
@@ -178,7 +178,11 @@ describe('objectPlain', () => {
     fn.z = 6
 
     class Klass {
-      name = 'test'
+      name: string
+
+      constructor(name?: string) {
+        this.name = name ?? 'test'
+      }
     }
 
     const obj = {
@@ -197,33 +201,51 @@ describe('objectPlain', () => {
           ['b', 2],
           [true, 'bool'],
         ]),
+        date: new Date(Date.UTC(2024, 0, 1, 12)),
         weakMap: new WeakMap(),
         uint8: new Uint8Array([1, 2, 3]),
         uint16: new Uint16Array([1, 2, 3]),
         c: 2,
         d: [3, 4, 5],
         Klass,
-        newKlass: new Klass(),
+        newKlass: new Klass('testNewKlass'),
       },
     }
+
     const result = objectPlain(obj, {
       keepAsIs: o => o instanceof Uint8Array,
       errorTrace: false,
+      transformer(obj) {
+        if (obj instanceof Date)
+          return { __timestamp: obj.getTime() }
+      },
     })
 
     expect(result).toMatchInlineSnapshot(`
       Object {
         "a": 1,
         "b": Object {
-          "Klass": Object {},
+          "Klass": Object {
+            "__class": "Function",
+          },
           "c": 2,
           "d": Array [
             3,
             4,
             5,
           ],
-          "err": "Error: err",
+          "date": Object {
+            "__timestamp": 1704110400000,
+          },
+          "err": Object {
+            "__class": "Error",
+            "cause": undefined,
+            "message": "err",
+            "name": "Error",
+            "stack": undefined,
+          },
           "fn": Object {
+            "__class": "Function",
             "z": 6,
           },
           "inf": Infinity,
@@ -234,9 +256,13 @@ describe('objectPlain', () => {
           },
           "nan": NaN,
           "newKlass": Object {
-            "name": "test",
+            "__class": "Klass",
+            "name": "testNewKlass",
+          },
+          "rx": Object {
+            "__class": "RegExp",
+            "source": "/.*?.test/gim",
           },
-          "rx": "/.*?.test/gim",
           "set": Array [
             1,
             Object {
@@ -254,7 +280,9 @@ describe('objectPlain', () => {
             2,
             3,
           ],
-          "weakMap": Object {},
+          "weakMap": Object {
+            "__class": "WeakMap",
+          },
           "x": "Symbol(x)",
           "y": 123n,
         },
diff --git a/src/common/data/object.ts b/src/common/data/object.ts
index 45e3290..1695beb 100644
--- a/src/common/data/object.ts
+++ b/src/common/data/object.ts
@@ -61,6 +61,7 @@ export function objectPlain(obj: any, opt?: {
   errorTrace?: boolean
   filter?: (value: any) => boolean
   keepAsIs?: (value: any) => boolean
+  transformer?: (value: any) => any | undefined
 }): any {
   const {
     maxDepth = 99,
@@ -69,6 +70,7 @@ export function objectPlain(obj: any, opt?: {
     errorTrace = true,
     filter = () => true,
     keepAsIs = () => false,
+    transformer = () => undefined,
   } = opt ?? {}
 
   const cycle: any = []
@@ -91,11 +93,25 @@ export function objectPlain(obj: any, opt?: {
 
     cycle.push(obj)
 
-    if (obj instanceof Date)
-      return obj.toISOString()
+    if (transformer) {
+      const result = transformer(obj)
+      if (result !== undefined)
+        return result
+    }
+
+    if (obj instanceof Date) {
+      return {
+        __class: 'Date',
+        value: obj.toISOString(),
+      }
+    }
 
-    if (obj instanceof RegExp)
-      return obj.toString()
+    if (obj instanceof RegExp) {
+      return {
+        __class: 'RegExp',
+        source: obj.toString(),
+      }
+    }
 
     if (obj instanceof Map)
       obj = Object.fromEntries(obj)
@@ -103,8 +119,21 @@ export function objectPlain(obj: any, opt?: {
     if (obj instanceof Set || isBinaryArray(obj))
       obj = Array.from(obj as any)
 
-    if (obj instanceof Error)
-      return `${obj.name || 'Error'}: ${obj.message}${errorTrace ? `\n${obj.stack}` : ''}`
+    if (obj instanceof Error) {
+      return {
+        __class: 'Error',
+        name: obj.name,
+        message: obj.message,
+        stack: errorTrace ? obj.stack : undefined,
+        cause: obj.cause ? String(obj.cause) : undefined,
+      }
+    }
+    // return `${obj.name || 'Error'}: ${obj.message}${errorTrace ? `\n${obj.stack}` : ''}`
+
+    /* if (obj instanceof Element) {
+      const attrs = obj.getAttributeNames().map(name => `${name}="${String(obj.getAttribute(name))}"`).join(' ')
+      return `<${[obj.tagName.toLocaleLowerCase(), ...attrs].join(' ')}}>`
+    }  */
 
     if (Array.isArray(obj)) {
       return obj
@@ -112,7 +141,21 @@ export function objectPlain(obj: any, opt?: {
         .map(o => handleObject(o, depth + 1))
     }
 
-    // if (isObject(obj) || isFunction(obj)) {
+    // For class objects just dump the first level of primitives
+    const objName = obj?.constructor?.name
+    if (objName && objName !== 'Object') {
+      const nobj: any = {
+        __class: objName,
+        // __code: obj.toString ? obj.toString() : undefined,
+      }
+      for (const k in obj) {
+        if (Object.hasOwn(obj, k) && isPrimitive(obj[k]))
+          nobj[k] = obj[k]
+      }
+      return nobj
+    }
+
+    // Plain objects are recursively dumped
     const nobj: any = {}
     for (const key in obj) {
       const value = obj[key]
@@ -120,7 +163,6 @@ export function objectPlain(obj: any, opt?: {
         nobj[key] = handleObject(value, depth + 1)
     }
     return nobj
-    // }
 
     // return undefined
   }
diff --git a/src/common/network.ts b/src/common/network.ts
index 0a207d3..7e4a27e 100644
--- a/src/common/network.ts
+++ b/src/common/network.ts
@@ -9,6 +9,8 @@ import { encodeQuery } from './data/url'
 import { DefaultLogger } from './log'
 import type { Json } from './types'
 
+// TODO: Abort signal https://codedrivendevelopment.com/posts/everything-about-abort-signal-timeout
+
 interface fetchOptionType {
   /** Returns the cache mode associated with request, which is a string indicating how the request will interact with the browser's cache when fetching. */
   cache?: RequestCache