diff --git a/_data/stdlib_index.json b/_data/stdlib_index.json
index 04f4870..3189300 100644
--- a/_data/stdlib_index.json
+++ b/_data/stdlib_index.json
@@ -126097,7 +126097,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 61
+            "line": 66
           },
           {
             "kind": "function",
@@ -126113,7 +126113,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 64
+            "line": 69
           },
           {
             "kind": "function",
@@ -126129,7 +126129,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 68
+            "line": 73
           },
           {
             "kind": "function",
@@ -126145,7 +126145,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 71
+            "line": 76
           },
           {
             "kind": "function",
@@ -126161,7 +126161,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 77
+            "line": 82
           },
           {
             "kind": "function",
@@ -126177,7 +126177,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 81
+            "line": 86
           },
           {
             "kind": "function",
@@ -126193,7 +126193,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 85
+            "line": 90
           },
           {
             "kind": "function",
@@ -126209,7 +126209,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 97
+            "line": 102
           },
           {
             "kind": "function",
@@ -126225,7 +126225,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 106
+            "line": 111
           }
         ],
         "enumMembers": [],
@@ -126442,6 +126442,37 @@
       }
     ]
   },
+  {
+    "package": "MultibyteDiagnostics",
+    "category": "file",
+    "categoryLabel": "File & Network",
+    "sourcePath": "wurst/file/MultibyteDiagnostics.wurst",
+    "githubUrl": "https://github.com/wurstscript/WurstStdlib2/blob/master/wurst/file/MultibyteDiagnostics.wurst",
+    "summary": "",
+    "summaryFirstLine": "",
+    "tags": [
+      "file"
+    ],
+    "imports": [],
+    "entities": [
+      {
+        "kind": "function",
+        "name": "runMultibyteDiagnostics",
+        "typeParams": "",
+        "receiver": null,
+        "signature": "public function runMultibyteDiagnostics()",
+        "doc": "",
+        "deprecated": {
+          "flag": false,
+          "message": null
+        },
+        "configurable": false,
+        "members": [],
+        "enumMembers": [],
+        "line": 30
+      }
+    ]
+  },
   {
     "package": "SaveLoadData",
     "category": "file",
@@ -148478,8 +148509,8 @@
     "categoryLabel": "Handle Wrappers",
     "sourcePath": "wurst/_handles/primitives/String.wurst",
     "githubUrl": "https://github.com/wurstscript/WurstStdlib2/blob/master/wurst/_handles/primitives/String.wurst",
-    "summary": "returns the position of the char in the charset\n\ttherefore converting a single char into an int that can\n\tbe converted back to a char with .toCharsetString()",
-    "summaryFirstLine": "returns the position of the char in the charset",
+    "summary": "A SubString slice that cuts a multibyte (non-latin) character in half does not\ncontain valid data. On current game versions such invalid slices are collapsed\nto a marker string with a constant string hash. Since this behavior is\nundocumented and has changed between game versions, the marker hash is computed\nat runtime from a known 2-byte character, so a future engine change degrades\ngracefully (multibyte detection turns off) instead of corrupting data.\nThe historically observed hash 1843378377 is kept as an additional fallback.",
+    "summaryFirstLine": "A SubString slice that cuts a multibyte (non-latin) character in half does not",
     "tags": [
       "handles"
     ],
@@ -148490,7 +148521,7 @@
         "name": "ENABLE_MULTIBYTE_SUPPORT",
         "typeParams": "",
         "receiver": null,
-        "signature": "public constant ENABLE_MULTIBYTE_SUPPORT = false",
+        "signature": "public constant ENABLE_MULTIBYTE_SUPPORT = true",
         "doc": "",
         "deprecated": {
           "flag": false,
@@ -148501,6 +148532,86 @@
         "enumMembers": [],
         "line": 7
       },
+      {
+        "kind": "constant",
+        "name": "PARTIAL_CHAR_MARKER",
+        "typeParams": "",
+        "receiver": null,
+        "signature": "public constant PARTIAL_CHAR_MARKER = \"ä\".substring(0, 1)",
+        "doc": "",
+        "deprecated": {
+          "flag": false,
+          "message": null
+        },
+        "configurable": false,
+        "members": [],
+        "enumMembers": [],
+        "line": 16
+      },
+      {
+        "kind": "constant",
+        "name": "PARTIAL_CHAR_HASH",
+        "typeParams": "",
+        "receiver": null,
+        "signature": "public constant PARTIAL_CHAR_HASH = PARTIAL_CHAR_MARKER.getHash()",
+        "doc": "",
+        "deprecated": {
+          "flag": false,
+          "message": null
+        },
+        "configurable": false,
+        "members": [],
+        "enumMembers": [],
+        "line": 17
+      },
+      {
+        "kind": "extension-function",
+        "name": "isMultibytePartial",
+        "typeParams": "",
+        "receiver": "string",
+        "signature": "public function string.isMultibytePartial() returns boolean",
+        "doc": "Returns true if this string is an invalid slice of a multibyte character.\n\tOnly meaningful when ENABLE_MULTIBYTE_SUPPORT is enabled.",
+        "deprecated": {
+          "flag": false,
+          "message": null
+        },
+        "configurable": false,
+        "members": [],
+        "enumMembers": [],
+        "line": 25
+      },
+      {
+        "kind": "constant",
+        "name": "LEAD4_HASH",
+        "typeParams": "",
+        "receiver": null,
+        "signature": "public constant LEAD4_HASH = \"😀\".substring(0, 1).getHash()",
+        "doc": "Hash of a slice containing only the lead byte 0xF0 of a 4-byte character\n\t(emoji and other astral plane chars), which the game does not collapse\n\tto the partial char marker.",
+        "deprecated": {
+          "flag": false,
+          "message": null
+        },
+        "configurable": false,
+        "members": [],
+        "enumMembers": [],
+        "line": 41
+      },
+      {
+        "kind": "extension-function",
+        "name": "isCharBoundary",
+        "typeParams": "",
+        "receiver": "string",
+        "signature": "public function string.isCharBoundary(int pos) returns boolean",
+        "doc": "Returns true if this string can be split at the given position without\n\tcutting a multibyte character in half, i.e. the byte at the given position\n\tstarts a new character instead of continuing a preceding one.\n\tPositions at or outside the string's bounds count as boundaries.\n\tOnly meaningful when ENABLE_MULTIBYTE_SUPPORT is enabled.",
+        "deprecated": {
+          "flag": false,
+          "message": null
+        },
+        "configurable": false,
+        "members": [],
+        "enumMembers": [],
+        "line": 52
+      },
       {
         "kind": "extension-function",
         "name": "isNotBlank",
@@ -148515,7 +148626,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 16
+        "line": 69
       },
       {
         "kind": "extension-function",
@@ -148523,7 +148634,7 @@
         "typeParams": "",
         "receiver": "string",
         "signature": "public function string.toCharsetInt() returns int",
-        "doc": "",
+        "doc": "returns the position of the char in the charset\n\ttherefore converting a single char into an int that can\n\tbe converted back to a char with .toCharsetString()",
         "deprecated": {
           "flag": false,
           "message": null
@@ -148531,7 +148642,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 22
+        "line": 75
       },
       {
         "kind": "extension-function",
@@ -148547,7 +148658,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 32
+        "line": 85
       },
       {
         "kind": "extension-function",
@@ -148563,7 +148674,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 36
+        "line": 89
       },
       {
         "kind": "extension-function",
@@ -148579,7 +148690,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 40
+        "line": 93
       },
       {
         "kind": "extension-function",
@@ -148595,7 +148706,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 44
+        "line": 97
       },
       {
         "kind": "extension-function",
@@ -148611,7 +148722,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 48
+        "line": 101
       },
       {
         "kind": "extension-function",
@@ -148627,7 +148738,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 52
+        "line": 105
       },
       {
         "kind": "extension-function",
@@ -148643,7 +148754,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 56
+        "line": 109
       },
       {
         "kind": "extension-function",
@@ -148659,7 +148770,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 60
+        "line": 113
       },
       {
         "kind": "extension-function",
@@ -148675,7 +148786,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 64
+        "line": 117
       },
       {
         "kind": "extension-function",
@@ -148691,7 +148802,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 73
+        "line": 126
       },
       {
         "kind": "extension-function",
@@ -148707,7 +148818,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 80
+        "line": 133
       },
       {
         "kind": "extension-function",
@@ -148723,7 +148834,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 84
+        "line": 137
       },
       {
         "kind": "extension-function",
@@ -148739,7 +148850,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 88
+        "line": 141
       },
       {
         "kind": "extension-function",
@@ -148755,7 +148866,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 92
+        "line": 145
       },
       {
         "kind": "extension-function",
@@ -148771,7 +148882,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 96
+        "line": 149
       },
       {
         "kind": "extension-function",
@@ -148787,7 +148898,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 106
+        "line": 159
       },
       {
         "kind": "extension-function",
@@ -148803,7 +148914,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 114
+        "line": 167
       },
       {
         "kind": "extension-function",
@@ -148819,7 +148930,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 121
+        "line": 174
       },
       {
         "kind": "extension-function",
@@ -148835,7 +148946,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 128
+        "line": 181
       },
       {
         "kind": "extension-function",
@@ -148851,7 +148962,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 135
+        "line": 188
       },
       {
         "kind": "extension-function",
@@ -148867,7 +148978,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 142
+        "line": 195
       },
       {
         "kind": "extension-function",
@@ -148883,7 +148994,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 154
+        "line": 207
       },
       {
         "kind": "extension-function",
@@ -148899,7 +149010,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 164
+        "line": 217
       },
       {
         "kind": "extension-function",
@@ -148915,7 +149026,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 171
+        "line": 224
       },
       {
         "kind": "extension-function",
@@ -148931,7 +149042,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 183
+        "line": 236
       },
       {
         "kind": "extension-function",
@@ -148947,7 +149058,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 187
+        "line": 240
       },
       {
         "kind": "extension-function",
@@ -148963,7 +149074,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 191
+        "line": 244
       },
       {
         "kind": "extension-function",
@@ -148979,7 +149090,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 197
+        "line": 250
       },
       {
         "kind": "extension-function",
@@ -148995,7 +149106,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 203
+        "line": 256
       },
       {
         "kind": "function",
@@ -149011,7 +149122,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 213
+        "line": 266
       },
       {
         "kind": "extension-function",
@@ -149027,7 +149138,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 230
+        "line": 283
       },
       {
         "kind": "extension-function",
@@ -149043,7 +149154,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 235
+        "line": 288
       },
       {
         "kind": "extension-function",
@@ -149059,7 +149170,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 243
+        "line": 296
       },
       {
         "kind": "class",
@@ -149088,7 +149199,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 251
+            "line": 304
           },
           {
             "kind": "function",
@@ -149104,7 +149215,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 256
+            "line": 309
           },
           {
             "kind": "function",
@@ -149120,7 +149231,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 259
+            "line": 312
           },
           {
             "kind": "function",
@@ -149136,11 +149247,11 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 268
+            "line": 331
           }
         ],
         "enumMembers": [],
-        "line": 246
+        "line": 299
       },
       {
         "kind": "class",
@@ -149169,7 +149280,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 278
+            "line": 341
           },
           {
             "kind": "function",
@@ -149185,7 +149296,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 284
+            "line": 347
           },
           {
             "kind": "function",
@@ -149201,7 +149312,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 288
+            "line": 351
           },
           {
             "kind": "function",
@@ -149217,7 +149328,7 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 292
+            "line": 355
           },
           {
             "kind": "function",
@@ -149233,11 +149344,11 @@
             "configurable": false,
             "members": [],
             "enumMembers": [],
-            "line": 299
+            "line": 362
           }
         ],
         "enumMembers": [],
-        "line": 272
+        "line": 335
       },
       {
         "kind": "extension-function",
@@ -149253,7 +149364,7 @@
         "configurable": false,
         "members": [],
         "enumMembers": [],
-        "line": 305
+        "line": 368
       }
     ]
   },
diff --git a/_doc/stdlib/ref/_handles/String.md b/_doc/stdlib/ref/_handles/String.md
index f984a42..f02868b 100644
--- a/_doc/stdlib/ref/_handles/String.md
+++ b/_doc/stdlib/ref/_handles/String.md
@@ -9,9 +9,13 @@ source: 'https://github.com/wurstscript/WurstStdlib2/blob/master/wurst/_handles/
 generated: true
 ---
 
-returns the position of the char in the charset
-	therefore converting a single char into an int that can
-	be converted back to a char with .toCharsetString()
+A SubString slice that cuts a multibyte (non-latin) character in half does not
+contain valid data. On current game versions such invalid slices are collapsed
+to a marker string with a constant string hash. Since this behavior is
+undocumented and has changed between game versions, the marker hash is computed
+at runtime from a known 2-byte character, so a future engine change degrades
+gracefully (multibyte detection turns off) instead of corrupting data.
+The historically observed hash 1843378377 is kept as an additional fallback.
 
 **[Source on GitHub](https://github.com/wurstscript/WurstStdlib2/blob/master/wurst/_handles/primitives/String.wurst)**
 
@@ -60,6 +64,27 @@ Returns an integer result based on a lexicographic string comparison of strings
 
 ## Extension Functions
 
+### string.isMultibytePartial
+
+```wurst
+public function string.isMultibytePartial() returns boolean
+```
+
+Returns true if this string is an invalid slice of a multibyte character.
+	Only meaningful when ENABLE_MULTIBYTE_SUPPORT is enabled.
+
+### string.isCharBoundary
+
+```wurst
+public function string.isCharBoundary(int pos) returns boolean
+```
+
+Returns true if this string can be split at the given position without
+	cutting a multibyte character in half, i.e. the byte at the given position
+	starts a new character instead of continuing a preceding one.
+	Positions at or outside the string's bounds count as boundaries.
+	Only meaningful when ENABLE_MULTIBYTE_SUPPORT is enabled.
+
 ### string.isNotBlank
 
 ```wurst
@@ -75,6 +100,10 @@ Returns true if this string is non-null and
 public function string.toCharsetInt() returns int
 ```
 
+returns the position of the char in the charset
+	therefore converting a single char into an int that can
+	be converted back to a char with .toCharsetString()
+
 ### string.toReal
 
 ```wurst
@@ -343,7 +372,29 @@ public function string.toLines() returns StringLines
 ### ENABLE_MULTIBYTE_SUPPORT
 
 ```wurst
-public constant ENABLE_MULTIBYTE_SUPPORT = false
+public constant ENABLE_MULTIBYTE_SUPPORT = true
 ```
 
 > 🔧 **Configurable.** Override it in your map's config package.
+
+### PARTIAL_CHAR_MARKER
+
+```wurst
+public constant PARTIAL_CHAR_MARKER = "ä".substring(0, 1)
+```
+
+### PARTIAL_CHAR_HASH
+
+```wurst
+public constant PARTIAL_CHAR_HASH = PARTIAL_CHAR_MARKER.getHash()
+```
+
+### LEAD4_HASH
+
+```wurst
+public constant LEAD4_HASH = "😀".substring(0, 1).getHash()
+```
+
+Hash of a slice containing only the lead byte 0xF0 of a 4-byte character
+	(emoji and other astral plane chars), which the game does not collapse
+	to the partial char marker.
diff --git a/_doc/stdlib/ref/file/MultibyteDiagnostics.md b/_doc/stdlib/ref/file/MultibyteDiagnostics.md
new file mode 100644
index 0000000..31e060e
--- /dev/null
+++ b/_doc/stdlib/ref/file/MultibyteDiagnostics.md
@@ -0,0 +1,20 @@
+---
+title: MultibyteDiagnostics
+layout: stdlibref
+category: file
+categoryLabel: File & Network
+tags:
+  - file
+source: 'https://github.com/wurstscript/WurstStdlib2/blob/master/wurst/file/MultibyteDiagnostics.wurst'
+generated: true
+---
+
+**[Source on GitHub](https://github.com/wurstscript/WurstStdlib2/blob/master/wurst/file/MultibyteDiagnostics.wurst)**
+
+## Functions
+
+### runMultibyteDiagnostics
+
+```wurst
+public function runMultibyteDiagnostics()
+```
diff --git a/_doc/stdlib/ref/index.md b/_doc/stdlib/ref/index.md
index d93d857..08e1487 100644
--- a/_doc/stdlib/ref/index.md
+++ b/_doc/stdlib/ref/index.md
@@ -81,6 +81,7 @@ Auto-generated reference for every package in the [Wurst standard library](https
 - [ChunkedString](/stdlib/ref/file/ChunkedString.html)
 - [FileIO](/stdlib/ref/file/FileIO.html)
 - [GameStatus](/stdlib/ref/file/GameStatus.html)
+- [MultibyteDiagnostics](/stdlib/ref/file/MultibyteDiagnostics.html)
 - [SaveLoadData](/stdlib/ref/file/SaveLoadData.html): Asynchronously loads the data from the file of the given player
 - [Serializable](/stdlib/ref/file/Serializable.html)
 - [SyncSimple](/stdlib/ref/file/SyncSimple.html)
@@ -140,7 +141,7 @@ Auto-generated reference for every package in the [Wurst standard library](https
 - [Reference](/stdlib/ref/_handles/Reference.html): A simple wrapper class which contains a reference to a value of the given type.
 - [Region](/stdlib/ref/_handles/Region.html)
 - [Sound](/stdlib/ref/_handles/Sound.html): Returns sound length in milliseconds.
-- [String](/stdlib/ref/_handles/String.html): returns the position of the char in the charset
+- [String](/stdlib/ref/_handles/String.html): A SubString slice that cuts a multibyte (non-latin) character in half does not
 - [Texttag](/stdlib/ref/_handles/Texttag.html)
 - [Timer](/stdlib/ref/_handles/Timer.html)
 - [TimerDialog](/stdlib/ref/_handles/TimerDialog.html): Multiplies the timer's tick rate and remaining time, so that the overall elapsed time stays the same.