diff --git a/package.json b/package.json
index 6b112f74..3e01023f 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "module": "./dist/yjs.mjs'",
   "sideEffects": false,
   "scripts": {
-    "test": "npm run lint && npm run dist &&",
+    "test": "npm run dist && node ./dist/tests.js --repitition-time 50",
     "test-exhaustive": "npm run lint && npm run dist && node ./dist/tests.js --repitition-time 10000",
     "dist": "rm -rf dist examples/build && rollup -c",
     "watch": "rollup -wc",
diff --git a/src/index.js b/src/index.js
index 43ab84d1..b99154e2 100644
--- a/src/index.js
+++ b/src/index.js
@@ -3,7 +3,7 @@ export { Y } from './utils/Y.js'
 export { UndoManager } from './utils/UndoManager.js'
 export { Transaction } from './utils/Transaction.js'
 
-export { Item } from './structs/Item.js'
+export { Item, stringifyItemID } from './structs/Item.js'
 export { Delete } from './structs/Delete.js'
 export { ItemJSON } from './structs/ItemJSON.js'
 export { ItemString } from './structs/ItemString.js'
@@ -27,6 +27,4 @@ export { deleteItemRange } from './utils/structManipulation.js'
 export { integrateRemoteStructs } from './utils/integrateRemoteStructs.js'
 export { isParentOf } from './utils/isParentOf.js'
 
-export { stringifyItemID } from './utils/structStringify.js'
-
 export * from './utils/structReferences.js'
diff --git a/src/structs/Delete.js b/src/structs/Delete.js
index d75186c7..5b93d3f2 100644
--- a/src/structs/Delete.js
+++ b/src/structs/Delete.js
@@ -7,10 +7,9 @@ import * as ID from '../utils/ID.js'
 import { writeStructToTransaction } from '../utils/structEncoding.js'
 import * as decoding from 'lib0/decoding.js'
 import * as encoding from 'lib0/encoding.js'
-// import { Item } from './Item.js' // eslint-disable-line
+import * as Item from './Item.js'
 // import { Y } from '../utils/Y.js' // eslint-disable-line
 import { deleteItemRange } from '../utils/structManipulation.js'
-import * as stringify from '../utils/structStringify.js'
 
 /**
  * @private
@@ -25,7 +24,7 @@ export class Delete {
      */
     this._targetID = null
     /**
-     * @type {Item}
+     * @type {Item.Item}
      */
     this._target = null
     this._length = null
@@ -99,6 +98,6 @@ export class Delete {
    * @private
    */
   _logString () {
-    return `Delete - target: ${stringify.stringifyID(this._targetID)}, len: ${this._length}`
+    return `Delete - target: ${Item.stringifyID(this._targetID)}, len: ${this._length}`
   }
 }
diff --git a/src/structs/Item.js b/src/structs/Item.js
index d4ee75a5..7b3848c8 100644
--- a/src/structs/Item.js
+++ b/src/structs/Item.js
@@ -10,6 +10,39 @@ import { GC } from './GC.js'
 import * as encoding from 'lib0/encoding.js'
 import * as decoding from 'lib0/decoding.js'
 
+/**
+ * Stringify an item id.
+ *
+ * @param {ID.ID | ID.RootID} id
+ * @return {string}
+ */
+export const stringifyID = id => id instanceof ID.ID ? `(${id.user},${id.clock})` : `(${id.name},${id.type})`
+
+/**
+ * Stringify an item as ID. HHere, an item could also be a Yjs instance (e.g. item._parent).
+ *
+ * @param {Item | Y | null} item
+ * @return {string}
+ */
+export const stringifyItemID = item =>
+  item === null ? '()' : (item._id != null ? stringifyID(item._id) : 'y')
+
+/**
+ * Helper utility to convert an item to a readable format.
+ *
+ * @param {String} name The name of the item class (YText, ItemString, ..).
+ * @param {Item} item The item instance.
+ * @param {String} [append] Additional information to append to the returned
+ *                          string.
+ * @return {String} A readable string that represents the item object.
+ *
+ */
+export const logItemHelper = (name, item, append) => {
+  const left = item._left !== null ? stringifyID(item._left._lastId) : '()'
+  const origin = item._origin !== null ? stringifyID(item._origin._lastId) : '()'
+  return `${name}(id:${stringifyItemID(item)},left:${left},origin:${origin},right:${stringifyItemID(item._right)},parent:${stringifyItemID(item._parent)},parentSub:${item._parentSub}${append !== undefined ? ' - ' + append : ''})`
+}
+
 /**
  * @private
  */
diff --git a/src/structs/ItemBinary.js b/src/structs/ItemBinary.js
index dd1fe957..1f8e6ae0 100644
--- a/src/structs/ItemBinary.js
+++ b/src/structs/ItemBinary.js
@@ -4,8 +4,7 @@
 
 // TODO: ItemBinary should be able to merge with right (similar to other items). Or the other items (ItemJSON) should not be able to merge - extra byte + consistency
 
-import { Item } from './Item.js'
-import * as stringify from '../utils/structStringify.js'
+import { Item, logItemHelper } from './Item.js'
 import * as encoding from 'lib0/encoding.js'
 import * as decoding from 'lib0/decoding.js'
 import { Y } from '../utils/Y.js' // eslint-disable-line
@@ -43,6 +42,6 @@ export class ItemBinary extends Item {
    * @private
    */
   _logString () {
-    return stringify.logItemHelper('ItemBinary', this)
+    return logItemHelper('ItemBinary', this)
   }
 }
diff --git a/src/structs/ItemEmbed.js b/src/structs/ItemEmbed.js
index 14cd85d6..252ab1ee 100644
--- a/src/structs/ItemEmbed.js
+++ b/src/structs/ItemEmbed.js
@@ -2,8 +2,7 @@
  * @module structs
  */
 
-import { Item } from './Item.js'
-import * as stringify from '../utils/structStringify.js'
+import { Item, logItemHelper } from './Item.js'
 import * as encoding from 'lib0/encoding.js'
 import * as decoding from 'lib0/decoding.js'
 import { Y } from '../utils/Y.js'  // eslint-disable-line
@@ -44,6 +43,6 @@ export class ItemEmbed extends Item {
    * @private
    */
   _logString () {
-    return stringify.logItemHelper('ItemEmbed', this, `embed:${JSON.stringify(this.embed)}`)
+    return logItemHelper('ItemEmbed', this, `embed:${JSON.stringify(this.embed)}`)
   }
 }
diff --git a/src/structs/ItemFormat.js b/src/structs/ItemFormat.js
index 40fa3b26..8c0e8056 100644
--- a/src/structs/ItemFormat.js
+++ b/src/structs/ItemFormat.js
@@ -2,8 +2,7 @@
  * @module structs
  */
 
-import { Item } from './Item.js'
-import * as stringify from '../utils/structStringify.js'
+import { Item, logItemHelper } from './Item.js'
 import * as encoding from 'lib0/encoding.js'
 import * as decoding from 'lib0/decoding.js'
 import { Y } from '../utils/Y.js' // eslint-disable-line
diff --git a/src/structs/ItemJSON.js b/src/structs/ItemJSON.js
index 7e29c8ae..e4933334 100644
--- a/src/structs/ItemJSON.js
+++ b/src/structs/ItemJSON.js
@@ -2,8 +2,7 @@
  * @module structs
  */
 
-import { Item, splitHelper } from './Item.js'
-import * as stringify from '../utils/structStringify.js'
+import { Item, splitHelper, logItemHelper } from './Item.js'
 import * as encoding from 'lib0/encoding.js'
 import * as decoding from 'lib0/decoding.js'
 import { Y } from '../utils/Y.js' // eslint-disable-line
@@ -67,7 +66,7 @@ export class ItemJSON extends Item {
    * @private
    */
   _logString () {
-    return stringify.logItemHelper('ItemJSON', this, `content:${JSON.stringify(this._content)}`)
+    return logItemHelper('ItemJSON', this, `content:${JSON.stringify(this._content)}`)
   }
   _splitAt (y, diff) {
     if (diff === 0) {
diff --git a/src/structs/ItemString.js b/src/structs/ItemString.js
index 0c613bfe..d4baa752 100644
--- a/src/structs/ItemString.js
+++ b/src/structs/ItemString.js
@@ -2,8 +2,7 @@
  * @module structs
  */
 
-import { Item, splitHelper } from './Item.js'
-import * as stringify from '../utils/structStringify.js'
+import { Item, splitHelper, logItemHelper } from './Item.js'
 import * as encoding from 'lib0/encoding.js'
 import * as decoding from 'lib0/decoding.js'
 import { Y } from '../utils/Y.js' // eslint-disable-line
@@ -44,7 +43,7 @@ export class ItemString extends Item {
    * @private
    */
   _logString () {
-    return stringify.logItemHelper('ItemString', this, `content:"${this._content}"`)
+    return logItemHelper('ItemString', this, `content:"${this._content}"`)
   }
   _splitAt (y, diff) {
     if (diff === 0) {
diff --git a/src/types/YArray.js b/src/types/YArray.js
index e31b081d..1e04527a 100644
--- a/src/types/YArray.js
+++ b/src/types/YArray.js
@@ -5,10 +5,9 @@
 import { Type } from '../structs/Type.js'
 import { ItemJSON } from '../structs/ItemJSON.js'
 import { ItemString } from '../structs/ItemString.js'
-import * as stringify from '../utils/structStringify.js'
 import { YEvent } from '../utils/YEvent.js'
 import { Transaction } from '../utils/Transaction.js' // eslint-disable-line
-import { Item } from '../structs/Item.js' // eslint-disable-line
+import { Item, stringifyItemID, logItemHelper } from '../structs/Item.js' // eslint-disable-line
 import { ItemBinary } from '../structs/ItemBinary.js'
 import { isVisible } from '../utils/snapshot.js'
 
@@ -402,6 +401,6 @@ export class YArray extends Type {
    * @private
    */
   _logString () {
-    return stringify.logItemHelper('YArray', this, `start:${stringify.stringifyItemID(this._start)}"`)
+    return logItemHelper('YArray', this, `start:${stringifyItemID(this._start)}"`)
   }
 }
diff --git a/src/types/YMap.js b/src/types/YMap.js
index 514ef2d5..fbcdfe9b 100644
--- a/src/types/YMap.js
+++ b/src/types/YMap.js
@@ -2,10 +2,9 @@
  * @module types
  */
 
-import { Item } from '../structs/Item.js'
+import { Item, logItemHelper } from '../structs/Item.js'
 import { Type } from '../structs/Type.js'
 import { ItemJSON } from '../structs/ItemJSON.js'
-import * as stringify from '../utils/structStringify.js'
 import { YEvent } from '../utils/YEvent.js'
 import { ItemBinary } from '../structs/ItemBinary.js'
 import { isVisible } from '../utils/snapshot.js'
@@ -208,6 +207,6 @@ export class YMap extends Type {
    * @private
    */
   _logString () {
-    return stringify.logItemHelper('YMap', this, `mapSize:${this._map.size}`)
+    return logItemHelper('YMap', this, `mapSize:${this._map.size}`)
   }
 }
diff --git a/src/types/YText.js b/src/types/YText.js
index c6d5f309..0d78f1de 100644
--- a/src/types/YText.js
+++ b/src/types/YText.js
@@ -2,10 +2,10 @@
  * @module types
  */
 
+import { logItemHelper } from '../structs/Item.js'
 import { ItemEmbed } from '../structs/ItemEmbed.js'
 import { ItemString } from '../structs/ItemString.js'
 import { ItemFormat } from '../structs/ItemFormat.js'
-import * as stringify from '../utils/structStringify.js'
 import { YArrayEvent, YArray } from './YArray.js'
 import { isVisible } from '../utils/snapshot.js'
 
@@ -720,6 +720,6 @@ export class YText extends YArray {
    * @private
    */
   _logString () {
-    return stringify.logItemHelper('YText', this)
+    return logItemHelper('YText', this)
   }
 }
diff --git a/src/types/YXmlElement.js b/src/types/YXmlElement.js
index 8d8ffad1..cd919739 100644
--- a/src/types/YXmlElement.js
+++ b/src/types/YXmlElement.js
@@ -2,13 +2,13 @@
  * @module types
  */
 
+import { logItemHelper } from '../structs/Item.js'
 import { YMap } from './YMap.js'
 import * as encoding from 'lib0/encoding.js'
 import * as decoding from 'lib0/decoding.js'
 import { Y } from '../utils/Y.js' // eslint-disable-line
 import { YArray } from './YArray.js'
 import { YXmlEvent } from './YXmlEvent.js'
-import * as stringify from '../utils/structStringify.js'
 
 /**
  * Define the elements to which a set of CSS queries apply.
@@ -234,7 +234,7 @@ export class YXmlFragment extends YArray {
    * @private
    */
   _logString () {
-    return stringify.logItemHelper('YXml', this)
+    return logItemHelper('YXml', this)
   }
 }
 
diff --git a/src/utils/OperationStore.js b/src/utils/OperationStore.js
index eb02aabb..4530234d 100644
--- a/src/utils/OperationStore.js
+++ b/src/utils/OperationStore.js
@@ -6,7 +6,7 @@ import { Tree } from 'lib0/tree.js'
 import * as ID from '../utils/ID.js'
 import { getStruct } from './structReferences.js'
 import { GC } from '../structs/GC.js'
-import * as stringify from './structStringify.js'
+import * as Item from '../structs/Item.js'
 
 export class OperationStore extends Tree {
   constructor (y) {
@@ -18,18 +18,18 @@ export class OperationStore extends Tree {
     this.iterate(null, null, item => {
       if (item.constructor === GC) {
         items.push({
-          id: stringify.stringifyItemID(item),
+          id: Item.stringifyItemID(item),
           content: item._length,
           deleted: 'GC'
         })
       } else {
         items.push({
-          id: stringify.stringifyItemID(item),
-          origin: item._origin === null ? '()' : stringify.stringifyID(item._origin._lastId),
-          left: item._left === null ? '()' : stringify.stringifyID(item._left._lastId),
-          right: stringify.stringifyItemID(item._right),
-          right_origin: stringify.stringifyItemID(item._right_origin),
-          parent: stringify.stringifyItemID(item._parent),
+          id: Item.stringifyItemID(item),
+          origin: item._origin === null ? '()' : Item.stringifyID(item._origin._lastId),
+          left: item._left === null ? '()' : Item.stringifyID(item._left._lastId),
+          right: Item.stringifyItemID(item._right),
+          right_origin: Item.stringifyItemID(item._right_origin),
+          parent: Item.stringifyItemID(item._parent),
           parentSub: item._parentSub,
           deleted: item._deleted,
           content: JSON.stringify(item._content)
diff --git a/src/utils/structStringify.js b/src/utils/structStringify.js
deleted file mode 100644
index 53bcd2bc..00000000
--- a/src/utils/structStringify.js
+++ /dev/null
@@ -1,46 +0,0 @@
-
-import * as ID from './ID.js'
-
-/**
- * Stringify an item id.
- *
- * @param {ID.ID | ID.RootID} id
- * @return {string}
- */
-export const stringifyID = id => id instanceof ID.ID ? `(${id.user},${id.clock})` : `(${id.name},${id.type})`
-
-/**
- * Stringify an item as ID. HHere, an item could also be a Yjs instance (e.g. item._parent).
- *
- * @param {Y.Item | Y.Y | null} item
- * @return {string}
- */
-export const stringifyItemID = item => {
-  let result
-  if (item === null) {
-    result = '()'
-  } else if (item._id != null) {
-    result = stringifyID(item._id)
-  } else {
-    // must be a Yjs instance
-    // Don't include Y in this module, so we prevent circular dependencies.
-    result = 'y'
-  }
-  return result
-}
-
-/**
- * Helper utility to convert an item to a readable format.
- *
- * @param {String} name The name of the item class (YText, ItemString, ..).
- * @param {Y.Item} item The item instance.
- * @param {String} [append] Additional information to append to the returned
- *                          string.
- * @return {String} A readable string that represents the item object.
- *
- */
-export const logItemHelper = (name, item, append) => {
-  const left = item._left !== null ? stringifyID(item._left._lastId) : '()'
-  const origin = item._origin !== null ? stringifyID(item._origin._lastId) : '()'
-  return `${name}(id:${stringifyItemID(item)},left:${left},origin:${origin},right:${stringifyItemID(item._right)},parent:${stringifyItemID(item._parent)},parentSub:${item._parentSub}${append !== undefined ? ' - ' + append : ''})`
-}