diff --git a/pkgs/intl4x/CHANGELOG.md b/pkgs/intl4x/CHANGELOG.md
index 594384b6..e711ad10 100644
--- a/pkgs/intl4x/CHANGELOG.md
+++ b/pkgs/intl4x/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.10.2-wip
+
+- Remove Dart parser of locale strings.
+
 ## 0.10.1
 
 - Upgrade to new artifacts.
diff --git a/pkgs/intl4x/lib/src/locale/locale_4x.dart b/pkgs/intl4x/lib/src/locale/locale_4x.dart
index f496b2a2..ed7928ec 100644
--- a/pkgs/intl4x/lib/src/locale/locale_4x.dart
+++ b/pkgs/intl4x/lib/src/locale/locale_4x.dart
@@ -5,12 +5,17 @@
 import '../bindings/lib.g.dart' as icu;
 
 import 'locale.dart';
+import 'locale_native.dart';
 
-extension Locale4X on Locale {
+extension Locale4XTransformer on Locale {
   icu.Locale to4X() {
-    final icu4xLocale = icu.Locale.und()..language = language;
-    if (region != null) icu4xLocale.region = region!;
-    if (script != null) icu4xLocale.script = script!;
-    return icu4xLocale;
+    if (this is IcuLocale) {
+      return (this as IcuLocale).locale;
+    } else {
+      final icu4xLocale = icu.Locale.und()..language = language;
+      if (region != null) icu4xLocale.region = region!;
+      if (script != null) icu4xLocale.script = script!;
+      return icu4xLocale;
+    }
   }
 }
diff --git a/pkgs/intl4x/lib/src/locale/locale_native.dart b/pkgs/intl4x/lib/src/locale/locale_native.dart
index 377b67e7..a332217c 100644
--- a/pkgs/intl4x/lib/src/locale/locale_native.dart
+++ b/pkgs/intl4x/lib/src/locale/locale_native.dart
@@ -2,41 +2,26 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import '../bindings/lib.g.dart' as icu;
 import 'locale.dart';
 
 /// This file should be replaced by references to ICU4X when ready.
 
-Locale parseLocaleWithSeparatorPlaceholder(String s, [String separator = '-']) {
-  final parsed = s.split(separator);
-  // ignore: unused_local_variable
-  final subtags = parsed.skipWhile((value) => value != 'u').toList();
-  final tags = parsed.takeWhile((value) => value != 'u').toList();
-  final language = tags.first;
-  final String? script;
-  final String? region;
-  if (tags.length == 2) {
-    if (tags[1].length == 2 && tags[1] == tags[1].toUpperCase()) {
-      region = tags[1];
-      script = null;
-    } else {
-      region = null;
-      script = tags[1];
-    }
-  } else if (tags.length == 3) {
-    script = tags[1];
-    region = tags[2];
-  } else {
-    script = null;
-    region = null;
-  }
+class IcuLocale extends Locale {
+  final icu.Locale locale;
 
-  return Locale(
-    language: language,
-    region: region,
-    script: script,
-  );
+  IcuLocale(this.locale)
+      : super(
+          language: locale.language,
+          region: locale.region,
+          script: locale.script,
+        );
 }
 
+Locale parseLocaleWithSeparatorPlaceholder(String s,
+        [String separator = '-']) =>
+    IcuLocale(icu.Locale.fromString(s));
+
 //TODO: Switch to ICU4X!
 Locale parseLocale(String s, [String separator = '-']) {
   if (s.contains('_')) {
diff --git a/pkgs/intl4x/pubspec.yaml b/pkgs/intl4x/pubspec.yaml
index e6db3305..b5a35d32 100644
--- a/pkgs/intl4x/pubspec.yaml
+++ b/pkgs/intl4x/pubspec.yaml
@@ -1,7 +1,7 @@
 name: intl4x
 description: >-
   A lightweight modular library for internationalization (i18n) functionality.
-version: 0.10.1
+version: 0.10.2-wip
 repository: https://github.com/dart-lang/i18n/tree/main/pkgs/intl4x
 platforms:
   web: