From a20f491abd66d7667c919b150cb3e8f8b3e1a237 Mon Sep 17 00:00:00 2001
From: Eemeli Aro <eemeli@gmail.com>
Date: Mon, 27 Oct 2025 19:40:45 +0200
Subject: [PATCH] Drop u:locale

---
 docs/goals.md                     |  1 -
 spec/functions/string.md          |  2 +-
 spec/u-namespace.md               | 42 -------------------------------
 test/README.md                    |  1 -
 test/schemas/v0/tests.schema.json |  3 +--
 test/tests/u-options.json         | 16 ------------
 6 files changed, 2 insertions(+), 63 deletions(-)

diff --git a/docs/goals.md b/docs/goals.md
index 57fac73c66..4edcaf7429 100644
--- a/docs/goals.md
+++ b/docs/goals.md
@@ -63,7 +63,6 @@ The MessageFormat Working Group is a working group of the CLDR-TC.
   - percent formatting
 - Deliver at least as Technical Preview (v49) and Stable (v50) all draft functions and options
   - `:unit`
-  - the `u:locale` option
 - Deliver as Technical Preview additional functions to support significant additional functionality.
   Such functions could include: lists, ranges, relative time, inflection.
 - Deliver as Technical Preview a machine-readable function description format or syntax.
diff --git a/spec/functions/string.md b/spec/functions/string.md
index 88f0c16367..41e140a275 100644
--- a/spec/functions/string.md
+++ b/spec/functions/string.md
@@ -32,7 +32,7 @@ The function `:string` has no _options_.
 > For example:
 >
 > ```
-> {$s :string u:dir=ltr u:locale=fr-CA}
+> {$s :string u:dir=ltr u:id=my-string}
 > ```
 
 ##### `:string` Resolved Value
diff --git a/spec/u-namespace.md b/spec/u-namespace.md
index 38a278af93..9e32d4b50e 100644
--- a/spec/u-namespace.md
+++ b/spec/u-namespace.md
@@ -40,48 +40,6 @@ or can be resolved to a string without error.
 For other values, a _Bad Option_ error is emitted
 and the `u:id` _option_ and its _option value_ are ignored.
 
-#### `u:locale`
-
-> [!IMPORTANT]
-> This _option_ has a status of **Draft**.
-> It is proposed for inclusion in a future release and is not Stable.
-
-Implementations MAY support this option.
-
-Replaces the _locale_ defined in the _function context_ for this _expression_.
-
-A comma-delimited list consisting of
-well-formed [BCP 47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt)
-language tags,
-or an implementation-defined list of such tags.
-
-If this _option_ is set on _markup_, a _Bad Option_ error is emitted
-and the `u:locale` _option_ and its _option value_ are ignored.
-
-During processing, the `u:locale` _option_
-MUST be removed from the resolved mapping of _options_
-before calling the _function handler_.
-
-Values matching the following ABNF are always accepted:
-```abnf
-u-locale-option = unicode_bcp47_locale_id *(o "," o unicode_bcp47_locale_id)
-```
-using `unicode_bcp47_locale_id` as defined for
-[Unicode Locale Identifier](https://unicode.org/reports/tr35/tr35.html#unicode_bcp47_locale_id).
-
-Implementations MAY support additional language tags,
-such as private-use or grandfathered tags,
-or tags using `_` instead of `-` as a separator.
-When the value of `u:locale` is set by a _variable_,
-implementations MAY support non-string values otherwise representing locales.
-
-Implementations MAY emit a _Bad Option_ error
-and MAY ignore the `u:locale` _option_ and _option value_ as a whole
-or any of the entries in the list of language tags.
-This might be because the locale specified is not supported
-or because the language tag is not well-formed,
-not valid, or some other reason.
-
 #### `u:dir`
 
 Implementations SHOULD support this option.
diff --git a/test/README.md b/test/README.md
index 352795f964..1d13807dc0 100644
--- a/test/README.md
+++ b/test/README.md
@@ -78,7 +78,6 @@ This may include one or more of the following:
 | `:percent` | The [:percent](../spec/functions/number.md#the-percent-function) function |
 | `u:dir`    | The [u:dir](../spec/u-namespace.md#udir) option                           |
 | `u:id`     | The [u:id](../spec/u-namespace.md#uid) option                             |
-| `u:locale` | The [u:locale](../spec/u-namespace.md#ulocale) option                     |
 
 ## Test Functions
 
diff --git a/test/schemas/v0/tests.schema.json b/test/schemas/v0/tests.schema.json
index 11a0d8ca2f..20e07feb84 100644
--- a/test/schemas/v0/tests.schema.json
+++ b/test/schemas/v0/tests.schema.json
@@ -206,8 +206,7 @@
         "enum": [
           ":percent",
           "u:dir",
-          "u:id",
-          "u:locale"
+          "u:id"
         ]
       }
     },
diff --git a/test/tests/u-options.json b/test/tests/u-options.json
index 80cbaa7748..e2a9539002 100644
--- a/test/tests/u-options.json
+++ b/test/tests/u-options.json
@@ -28,22 +28,6 @@
         { "type": "markup", "kind": "close", "name": "ns:tag" }
       ]
     },
-    {
-      "tags": ["u:locale"],
-      "src": "hello {4.2 :number u:locale=fr}",
-      "exp": "hello 4,2"
-    },
-    {
-      "tags": ["u:dir", "u:locale"],
-      "src": "{#tag u:dir=rtl u:locale=ar}content{/ns:tag}",
-      "exp": "content",
-      "expErrors": [{ "type": "bad-option" }],
-      "expParts": [
-        { "type": "markup", "kind": "open", "name": "tag" },
-        { "type": "text", "value": "content" },
-        { "type": "markup", "kind": "close", "name": "ns:tag" }
-      ]
-    },
     {
       "tags": ["u:dir", "u:id"],
       "src": "hello {world :string u:dir=ltr u:id=foo}",