all_locale_ids/1 returns the expanded list

Author: kipcole9

CHANGELOG.md

@@ -4,11 +4,17 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.4.0] — April 13th, 2026
+
+### Bug Fixes
+
+* `Localize.all_locale_ids/1` (`:modern`, `:moderate`, `:basic`) now returns the correct expanded list of locales. Thanks to @cw789 for the report.
+
 ## [0.3.0] — April 13th, 2026
 
 ### Bug Fixes
 
-* Load custom units in a single batch to avoid churning ``:persistent_store``
+* Load custom units in a single batch to avoid churning `:persistent_store`
 
 ## [0.2.0] — April 13th, 2026
 

README.md

@@ -130,7 +130,6 @@ config :localize,
 |--------|---------|-------------|
 | `:default_locale` | Derived from `LOCALIZE_DEFAULT_LOCALE` env var, then `LANG` env var, then `:en`. | The application-wide default locale. Can also be set at runtime with `Localize.put_default_locale/1`. |
 | `:supported_locales` | `nil` | A list of locale identifiers that your application supports. Each entry is an atom matching a known CLDR locale (e.g., `:en`, `:"fr-CA"`), a wildcard string (e.g., `"en-*"`), a coverage-level keyword (`:modern`, `:moderate`, `:basic`), or a Gettext-style string (e.g., `"pt_BR"`, `"zh_Hans"`). POSIX-style underscores are normalised to hyphens and entries are resolved to their CLDR canonical form via likely-subtag resolution (e.g. `"pt_BR"` → `:pt`). Only exact matches (score 0) are accepted — entries that cannot be resolved log a warning with `domain: :localize` and are skipped. When set, `validate_locale/1` resolves locale identifiers against this list rather than all ~766 CLDR locales. Accessible at runtime via `Localize.supported_locales/0`. |
-| `:preload_locales` | **deprecated** | Deprecated and ignored. Use `:supported_locales` to declare your locale set and `mix localize.download_locales` to pre-populate the cache at build time. |
 | `:locale_provider` | `Localize.Locale.Provider.PersistentTerm` | Module that implements the `Localize.Locale.Provider` behaviour for loading and caching per-locale data. |
 | `:locale_cache_max_entries` | `1_000` | Maximum number of validated locales to hold in the ETS cache. A background sweeper runs every 10 seconds and evicts excess entries to prevent unbounded growth. |
 | `:format_cache_max_entries` | `2_000` | Maximum number of compiled format patterns (number and date/time) to hold in the ETS cache. A background sweeper runs every 10 seconds and evicts excess entries to prevent unbounded growth. |

data/supplemental.ex

@@ -744,9 +744,11 @@ defmodule Localize.Data.Supplemental do
 
   """
   def generate_coverage_levels do
+    # CLDR provides effectiveCoverageLevels which includes regional
+    # variants pre-expanded via the locale inheritance chain.
     raw =
       Localize.Data.read_json("coverageLevels.json")
-      |> Map.fetch!("coverageLevels")
+      |> Map.fetch!("effectiveCoverageLevels")
 
     grouped =
       Enum.group_by(raw, fn {_locale, level} -> level end, fn {locale, _level} -> locale end)

mix.exs

@@ -1,7 +1,7 @@
 defmodule Localize.MixProject do
   use Mix.Project
 
-  @version "0.3.0"
+  @version "0.4.0"
   @cldr_version_path "priv/localize/version"
   @localize_patch_version_path "priv/localize/localize_patch_version"