Add UN M.49 region containment support by ptr727 · Pull Request #193 · ptr727/LanguageTags

ptr727 · 2026-06-26T16:11:22Z

Resolves#175.

What

Matching a UN M.49 region group against a contained region now works, e.g. es-419 (Latin America and the Caribbean) matches es-MX (Mexico).

Changes

New UnM49Data dataset sourced from Unicode CLDR territoryContainment, parsed with XmlReader (reflection-free, keeps the library AOT compatible — XmlSerializer is avoided), then JSON converted and code generated following the existing ISO/RFC dataset pattern.
LanguageLookup.IsMatch(prefix, tag, regionContainment) — opt-in overload. The existing two-argument IsMatch is unchanged and delegates with regionContainment: false, so there is no behaviour change and no extra work in the default path. Matching is directional: the broad group in the prefix matches the specific region in the tag, not the reverse.
LanguageLookup.ExpandRegion — expands a tag region into the tag plus a variant per containing UN M.49 group, e.g. es-MX → es-013, es-419, es-019, es-001.
Parser fix — ValidateExtendedLanguage now requires 3 alpha per RFC 5646 (extlang = 3ALPHA), so a numeric region following the language parses as a region instead of an extended language, e.g. es-419.
Restored previously trimmed control-flow comments in the parser and lookup.
Docs: README usage example + references, HISTORY entry, version.json bumped to 1.4.

Design notes

419 is a grouping="true" overlay in CLDR (not a canonical tree node), so the loader keeps grouping overlays and skips only status="deprecated" entries — dropping overlays would remove 419 entirely.
001 (World) is the universal ancestor, so es-001 matches any es tag with a region; documented in the API and covered by a test.

Testing

New UnM49Tests (dataset round-trip, Find, Contains, GetAncestors) and LanguageLookupTests theories covering the containment matching and ExpandRegion, including the directional and backward-compatibility cases.
Full suite: 293/293 passing. Build clean with AOT reference verification enabled.

🤖 Generated with Claude Code

Resolve#175 - match a UN M.49 region group against a contained region, e.g. es-419 (Latin America) matches es-MX (Mexico). - Add UnM49Data sourced from the CLDR territoryContainment data, parsed with XmlReader to keep the library AOT compatible, generated and embedded following the existing dataset pattern. - Add LanguageLookup.IsMatch(prefix, tag, regionContainment) as an opt-in overload; the existing two argument IsMatch is unchanged. - Add LanguageLookup.ExpandRegion to expand a region into its containing UN M.49 groups. - Fix ValidateExtendedLanguage to require 3 alpha so a numeric region following the language parses as a region, e.g. es-419. - Restore previously trimmed control flow comments in the parser and lookup. - Update README and HISTORY, add UN M.49 references, bump version to 1.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Adds UN M.49 (CLDR territoryContainment) region containment support to the LanguageTags library so numeric region groups (e.g., 419) can be matched against contained regions (e.g., MX), and enables region expansion to ancestor group regions.

Changes:

Introduces UnM49Data (XML loader + JSON/codegen + embedded generated dataset) sourced from Unicode CLDR territory containment.
Adds LanguageLookup.IsMatch(prefix, tag, regionContainment) overload and LanguageLookup.ExpandRegion() for containment-based matching/expansion.
Fixes parsing so extlang requires 3ALPHA, ensuring numeric regions like es-419 parse as a region.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.json	Bumps library version to 1.4.
README.md	Documents UN M.49 containment matching and region expansion; updates links and release-notes snippet.
HISTORY.md	Adds 1.4 release entry describing containment support and parser fix.
LanguageTagsCreate/CreateTagData.cs	Extends codegen pipeline to download/convert/generate UN M.49 data and code.
LanguageTags/UnM49Data.cs	Implements UN M.49 loader (XmlReader), JSON serialization, code generation, and query APIs (Find/Contains/GetAncestors).
LanguageTags/UnM49DataGen.cs	Adds generated embedded UN M.49 dataset used by `UnM49Data.Create()`.
LanguageData/unm49.json	Adds generated JSON form of the UN M.49 dataset.
LanguageTags/LanguageSchema.cs	Registers `UnM49Data` in the source-generated `JsonSerializerContext`.
LanguageTags/LanguageLookup.cs	Adds containment-aware matching overload and `ExpandRegion()`; wires in UN M.49 dataset usage.
LanguageTags/LanguageTagParser.cs	Tightens `extlang` validation to `3ALPHA` so numeric regions don’t misparse as extlang; restores control-flow comments.
LanguageTagsTests/UnM49Tests.cs	Adds tests for UN M.49 dataset loading/round-tripping and basic query behavior.
LanguageTagsTests/LanguageLookupTests.cs	Adds tests for containment matching (directional + opt-in) and `ExpandRegion()`.

- Region containment matching now substitutes the candidate region and reuses the plain matcher, preserving variant, extension, and private use semantics to avoid false positives, e.g. es-419-nedis no longer matches es-MX while es-419 still matches es-MX-nedis. - Clarify UnM49Data.Find returns the first of possibly multiple records for a code, and point to GetAncestors/Contains for full transitive containment. - Clarify UnM49Record.Code may be an alphabetic CLDR grouping code (EU, EZ, UN). - Add region containment tests for script preservation and prefix variants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Release: promote develop to main - UN M.49 region containment (#193, version floor 1.4) - Release-workflow fixes re-synced from template (#196: #213/#214/#217) Conflicts in three workflow files were the parallel setup-dotnet dependabot bump (identical on both branches); resolved to develop's authoritative versions (newer template re-sync + the workflow fixes).

ptr727 · 2026-06-26T16:11:22Z

Resolves#175.

What

Matching a UN M.49 region group against a contained region now works, e.g. es-419 (Latin America and the Caribbean) matches es-MX (Mexico).

Changes

New UnM49Data dataset sourced from Unicode CLDR territoryContainment, parsed with XmlReader (reflection-free, keeps the library AOT compatible — XmlSerializer is avoided), then JSON converted and code generated following the existing ISO/RFC dataset pattern.
LanguageLookup.IsMatch(prefix, tag, regionContainment) — opt-in overload. The existing two-argument IsMatch is unchanged and delegates with regionContainment: false, so there is no behaviour change and no extra work in the default path. Matching is directional: the broad group in the prefix matches the specific region in the tag, not the reverse.
LanguageLookup.ExpandRegion — expands a tag region into the tag plus a variant per containing UN M.49 group, e.g. es-MX → es-013, es-419, es-019, es-001.
Parser fix — ValidateExtendedLanguage now requires 3 alpha per RFC 5646 (extlang = 3ALPHA), so a numeric region following the language parses as a region instead of an extended language, e.g. es-419.
Restored previously trimmed control-flow comments in the parser and lookup.
Docs: README usage example + references, HISTORY entry, version.json bumped to 1.4.

Design notes

419 is a grouping="true" overlay in CLDR (not a canonical tree node), so the loader keeps grouping overlays and skips only status="deprecated" entries — dropping overlays would remove 419 entirely.
001 (World) is the universal ancestor, so es-001 matches any es tag with a region; documented in the API and covered by a test.

Testing

New UnM49Tests (dataset round-trip, Find, Contains, GetAncestors) and LanguageLookupTests theories covering the containment matching and ExpandRegion, including the directional and backward-compatibility cases.
Full suite: 293/293 passing. Build clean with AOT reference verification enabled.

🤖 Generated with Claude Code

Resolve#175 - match a UN M.49 region group against a contained region, e.g. es-419 (Latin America) matches es-MX (Mexico). - Add UnM49Data sourced from the CLDR territoryContainment data, parsed with XmlReader to keep the library AOT compatible, generated and embedded following the existing dataset pattern. - Add LanguageLookup.IsMatch(prefix, tag, regionContainment) as an opt-in overload; the existing two argument IsMatch is unchanged. - Add LanguageLookup.ExpandRegion to expand a region into its containing UN M.49 groups. - Fix ValidateExtendedLanguage to require 3 alpha so a numeric region following the language parses as a region, e.g. es-419. - Restore previously trimmed control flow comments in the parser and lookup. - Update README and HISTORY, add UN M.49 references, bump version to 1.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Adds UN M.49 (CLDR territoryContainment) region containment support to the LanguageTags library so numeric region groups (e.g., 419) can be matched against contained regions (e.g., MX), and enables region expansion to ancestor group regions.

Changes:

Introduces UnM49Data (XML loader + JSON/codegen + embedded generated dataset) sourced from Unicode CLDR territory containment.
Adds LanguageLookup.IsMatch(prefix, tag, regionContainment) overload and LanguageLookup.ExpandRegion() for containment-based matching/expansion.
Fixes parsing so extlang requires 3ALPHA, ensuring numeric regions like es-419 parse as a region.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.json	Bumps library version to 1.4.
README.md	Documents UN M.49 containment matching and region expansion; updates links and release-notes snippet.
HISTORY.md	Adds 1.4 release entry describing containment support and parser fix.
LanguageTagsCreate/CreateTagData.cs	Extends codegen pipeline to download/convert/generate UN M.49 data and code.
LanguageTags/UnM49Data.cs	Implements UN M.49 loader (XmlReader), JSON serialization, code generation, and query APIs (Find/Contains/GetAncestors).
LanguageTags/UnM49DataGen.cs	Adds generated embedded UN M.49 dataset used by `UnM49Data.Create()`.
LanguageData/unm49.json	Adds generated JSON form of the UN M.49 dataset.
LanguageTags/LanguageSchema.cs	Registers `UnM49Data` in the source-generated `JsonSerializerContext`.
LanguageTags/LanguageLookup.cs	Adds containment-aware matching overload and `ExpandRegion()`; wires in UN M.49 dataset usage.
LanguageTags/LanguageTagParser.cs	Tightens `extlang` validation to `3ALPHA` so numeric regions don’t misparse as extlang; restores control-flow comments.
LanguageTagsTests/UnM49Tests.cs	Adds tests for UN M.49 dataset loading/round-tripping and basic query behavior.
LanguageTagsTests/LanguageLookupTests.cs	Adds tests for containment matching (directional + opt-in) and `ExpandRegion()`.

- Region containment matching now substitutes the candidate region and reuses the plain matcher, preserving variant, extension, and private use semantics to avoid false positives, e.g. es-419-nedis no longer matches es-MX while es-419 still matches es-MX-nedis. - Clarify UnM49Data.Find returns the first of possibly multiple records for a code, and point to GetAncestors/Contains for full transitive containment. - Clarify UnM49Record.Code may be an alphabetic CLDR grouping code (EU, EZ, UN). - Add region containment tests for script preservation and prefix variants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Release: promote develop to main - UN M.49 region containment (#193, version floor 1.4) - Release-workflow fixes re-synced from template (#196: #213/#214/#217) Conflicts in three workflow files were the parallel setup-dotnet dependabot bump (identical on both branches); resolved to develop's authoritative versions (newer template re-sync + the workflow fixes).

ptr727 · 2026-06-26T16:11:22Z

Resolves#175.

What

Matching a UN M.49 region group against a contained region now works, e.g. es-419 (Latin America and the Caribbean) matches es-MX (Mexico).

Changes

New UnM49Data dataset sourced from Unicode CLDR territoryContainment, parsed with XmlReader (reflection-free, keeps the library AOT compatible — XmlSerializer is avoided), then JSON converted and code generated following the existing ISO/RFC dataset pattern.
LanguageLookup.IsMatch(prefix, tag, regionContainment) — opt-in overload. The existing two-argument IsMatch is unchanged and delegates with regionContainment: false, so there is no behaviour change and no extra work in the default path. Matching is directional: the broad group in the prefix matches the specific region in the tag, not the reverse.
LanguageLookup.ExpandRegion — expands a tag region into the tag plus a variant per containing UN M.49 group, e.g. es-MX → es-013, es-419, es-019, es-001.
Parser fix — ValidateExtendedLanguage now requires 3 alpha per RFC 5646 (extlang = 3ALPHA), so a numeric region following the language parses as a region instead of an extended language, e.g. es-419.
Restored previously trimmed control-flow comments in the parser and lookup.
Docs: README usage example + references, HISTORY entry, version.json bumped to 1.4.

Design notes

419 is a grouping="true" overlay in CLDR (not a canonical tree node), so the loader keeps grouping overlays and skips only status="deprecated" entries — dropping overlays would remove 419 entirely.
001 (World) is the universal ancestor, so es-001 matches any es tag with a region; documented in the API and covered by a test.

Testing

New UnM49Tests (dataset round-trip, Find, Contains, GetAncestors) and LanguageLookupTests theories covering the containment matching and ExpandRegion, including the directional and backward-compatibility cases.
Full suite: 293/293 passing. Build clean with AOT reference verification enabled.

🤖 Generated with Claude Code

Resolve#175 - match a UN M.49 region group against a contained region, e.g. es-419 (Latin America) matches es-MX (Mexico). - Add UnM49Data sourced from the CLDR territoryContainment data, parsed with XmlReader to keep the library AOT compatible, generated and embedded following the existing dataset pattern. - Add LanguageLookup.IsMatch(prefix, tag, regionContainment) as an opt-in overload; the existing two argument IsMatch is unchanged. - Add LanguageLookup.ExpandRegion to expand a region into its containing UN M.49 groups. - Fix ValidateExtendedLanguage to require 3 alpha so a numeric region following the language parses as a region, e.g. es-419. - Restore previously trimmed control flow comments in the parser and lookup. - Update README and HISTORY, add UN M.49 references, bump version to 1.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Adds UN M.49 (CLDR territoryContainment) region containment support to the LanguageTags library so numeric region groups (e.g., 419) can be matched against contained regions (e.g., MX), and enables region expansion to ancestor group regions.

Changes:

Introduces UnM49Data (XML loader + JSON/codegen + embedded generated dataset) sourced from Unicode CLDR territory containment.
Adds LanguageLookup.IsMatch(prefix, tag, regionContainment) overload and LanguageLookup.ExpandRegion() for containment-based matching/expansion.
Fixes parsing so extlang requires 3ALPHA, ensuring numeric regions like es-419 parse as a region.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.json	Bumps library version to 1.4.
README.md	Documents UN M.49 containment matching and region expansion; updates links and release-notes snippet.
HISTORY.md	Adds 1.4 release entry describing containment support and parser fix.
LanguageTagsCreate/CreateTagData.cs	Extends codegen pipeline to download/convert/generate UN M.49 data and code.
LanguageTags/UnM49Data.cs	Implements UN M.49 loader (XmlReader), JSON serialization, code generation, and query APIs (Find/Contains/GetAncestors).
LanguageTags/UnM49DataGen.cs	Adds generated embedded UN M.49 dataset used by `UnM49Data.Create()`.
LanguageData/unm49.json	Adds generated JSON form of the UN M.49 dataset.
LanguageTags/LanguageSchema.cs	Registers `UnM49Data` in the source-generated `JsonSerializerContext`.
LanguageTags/LanguageLookup.cs	Adds containment-aware matching overload and `ExpandRegion()`; wires in UN M.49 dataset usage.
LanguageTags/LanguageTagParser.cs	Tightens `extlang` validation to `3ALPHA` so numeric regions don’t misparse as extlang; restores control-flow comments.
LanguageTagsTests/UnM49Tests.cs	Adds tests for UN M.49 dataset loading/round-tripping and basic query behavior.
LanguageTagsTests/LanguageLookupTests.cs	Adds tests for containment matching (directional + opt-in) and `ExpandRegion()`.

- Region containment matching now substitutes the candidate region and reuses the plain matcher, preserving variant, extension, and private use semantics to avoid false positives, e.g. es-419-nedis no longer matches es-MX while es-419 still matches es-MX-nedis. - Clarify UnM49Data.Find returns the first of possibly multiple records for a code, and point to GetAncestors/Contains for full transitive containment. - Clarify UnM49Record.Code may be an alphabetic CLDR grouping code (EU, EZ, UN). - Add region containment tests for script preservation and prefix variants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Release: promote develop to main - UN M.49 region containment (#193, version floor 1.4) - Release-workflow fixes re-synced from template (#196: #213/#214/#217) Conflicts in three workflow files were the parallel setup-dotnet dependabot bump (identical on both branches); resolved to develop's authoritative versions (newer template re-sync + the workflow fixes).

ptr727 · 2026-06-26T16:11:22Z

Resolves#175.

What

Matching a UN M.49 region group against a contained region now works, e.g. es-419 (Latin America and the Caribbean) matches es-MX (Mexico).

Changes

New UnM49Data dataset sourced from Unicode CLDR territoryContainment, parsed with XmlReader (reflection-free, keeps the library AOT compatible — XmlSerializer is avoided), then JSON converted and code generated following the existing ISO/RFC dataset pattern.
LanguageLookup.IsMatch(prefix, tag, regionContainment) — opt-in overload. The existing two-argument IsMatch is unchanged and delegates with regionContainment: false, so there is no behaviour change and no extra work in the default path. Matching is directional: the broad group in the prefix matches the specific region in the tag, not the reverse.
LanguageLookup.ExpandRegion — expands a tag region into the tag plus a variant per containing UN M.49 group, e.g. es-MX → es-013, es-419, es-019, es-001.
Parser fix — ValidateExtendedLanguage now requires 3 alpha per RFC 5646 (extlang = 3ALPHA), so a numeric region following the language parses as a region instead of an extended language, e.g. es-419.
Restored previously trimmed control-flow comments in the parser and lookup.
Docs: README usage example + references, HISTORY entry, version.json bumped to 1.4.

Design notes

419 is a grouping="true" overlay in CLDR (not a canonical tree node), so the loader keeps grouping overlays and skips only status="deprecated" entries — dropping overlays would remove 419 entirely.
001 (World) is the universal ancestor, so es-001 matches any es tag with a region; documented in the API and covered by a test.

Testing

New UnM49Tests (dataset round-trip, Find, Contains, GetAncestors) and LanguageLookupTests theories covering the containment matching and ExpandRegion, including the directional and backward-compatibility cases.
Full suite: 293/293 passing. Build clean with AOT reference verification enabled.

🤖 Generated with Claude Code

Resolve#175 - match a UN M.49 region group against a contained region, e.g. es-419 (Latin America) matches es-MX (Mexico). - Add UnM49Data sourced from the CLDR territoryContainment data, parsed with XmlReader to keep the library AOT compatible, generated and embedded following the existing dataset pattern. - Add LanguageLookup.IsMatch(prefix, tag, regionContainment) as an opt-in overload; the existing two argument IsMatch is unchanged. - Add LanguageLookup.ExpandRegion to expand a region into its containing UN M.49 groups. - Fix ValidateExtendedLanguage to require 3 alpha so a numeric region following the language parses as a region, e.g. es-419. - Restore previously trimmed control flow comments in the parser and lookup. - Update README and HISTORY, add UN M.49 references, bump version to 1.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Adds UN M.49 (CLDR territoryContainment) region containment support to the LanguageTags library so numeric region groups (e.g., 419) can be matched against contained regions (e.g., MX), and enables region expansion to ancestor group regions.

Changes:

Introduces UnM49Data (XML loader + JSON/codegen + embedded generated dataset) sourced from Unicode CLDR territory containment.
Adds LanguageLookup.IsMatch(prefix, tag, regionContainment) overload and LanguageLookup.ExpandRegion() for containment-based matching/expansion.
Fixes parsing so extlang requires 3ALPHA, ensuring numeric regions like es-419 parse as a region.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.json	Bumps library version to 1.4.
README.md	Documents UN M.49 containment matching and region expansion; updates links and release-notes snippet.
HISTORY.md	Adds 1.4 release entry describing containment support and parser fix.
LanguageTagsCreate/CreateTagData.cs	Extends codegen pipeline to download/convert/generate UN M.49 data and code.
LanguageTags/UnM49Data.cs	Implements UN M.49 loader (XmlReader), JSON serialization, code generation, and query APIs (Find/Contains/GetAncestors).
LanguageTags/UnM49DataGen.cs	Adds generated embedded UN M.49 dataset used by `UnM49Data.Create()`.
LanguageData/unm49.json	Adds generated JSON form of the UN M.49 dataset.
LanguageTags/LanguageSchema.cs	Registers `UnM49Data` in the source-generated `JsonSerializerContext`.
LanguageTags/LanguageLookup.cs	Adds containment-aware matching overload and `ExpandRegion()`; wires in UN M.49 dataset usage.
LanguageTags/LanguageTagParser.cs	Tightens `extlang` validation to `3ALPHA` so numeric regions don’t misparse as extlang; restores control-flow comments.
LanguageTagsTests/UnM49Tests.cs	Adds tests for UN M.49 dataset loading/round-tripping and basic query behavior.
LanguageTagsTests/LanguageLookupTests.cs	Adds tests for containment matching (directional + opt-in) and `ExpandRegion()`.

- Region containment matching now substitutes the candidate region and reuses the plain matcher, preserving variant, extension, and private use semantics to avoid false positives, e.g. es-419-nedis no longer matches es-MX while es-419 still matches es-MX-nedis. - Clarify UnM49Data.Find returns the first of possibly multiple records for a code, and point to GetAncestors/Contains for full transitive containment. - Clarify UnM49Record.Code may be an alphabetic CLDR grouping code (EU, EZ, UN). - Add region containment tests for script preservation and prefix variants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Release: promote develop to main - UN M.49 region containment (#193, version floor 1.4) - Release-workflow fixes re-synced from template (#196: #213/#214/#217) Conflicts in three workflow files were the parallel setup-dotnet dependabot bump (identical on both branches); resolved to develop's authoritative versions (newer template re-sync + the workflow fixes).

ptr727 · 2026-06-26T16:11:22Z

Resolves#175.

What

Matching a UN M.49 region group against a contained region now works, e.g. es-419 (Latin America and the Caribbean) matches es-MX (Mexico).

Changes

New UnM49Data dataset sourced from Unicode CLDR territoryContainment, parsed with XmlReader (reflection-free, keeps the library AOT compatible — XmlSerializer is avoided), then JSON converted and code generated following the existing ISO/RFC dataset pattern.
LanguageLookup.IsMatch(prefix, tag, regionContainment) — opt-in overload. The existing two-argument IsMatch is unchanged and delegates with regionContainment: false, so there is no behaviour change and no extra work in the default path. Matching is directional: the broad group in the prefix matches the specific region in the tag, not the reverse.
LanguageLookup.ExpandRegion — expands a tag region into the tag plus a variant per containing UN M.49 group, e.g. es-MX → es-013, es-419, es-019, es-001.
Parser fix — ValidateExtendedLanguage now requires 3 alpha per RFC 5646 (extlang = 3ALPHA), so a numeric region following the language parses as a region instead of an extended language, e.g. es-419.
Restored previously trimmed control-flow comments in the parser and lookup.
Docs: README usage example + references, HISTORY entry, version.json bumped to 1.4.

Design notes

419 is a grouping="true" overlay in CLDR (not a canonical tree node), so the loader keeps grouping overlays and skips only status="deprecated" entries — dropping overlays would remove 419 entirely.
001 (World) is the universal ancestor, so es-001 matches any es tag with a region; documented in the API and covered by a test.

Testing

New UnM49Tests (dataset round-trip, Find, Contains, GetAncestors) and LanguageLookupTests theories covering the containment matching and ExpandRegion, including the directional and backward-compatibility cases.
Full suite: 293/293 passing. Build clean with AOT reference verification enabled.

🤖 Generated with Claude Code

Resolve#175 - match a UN M.49 region group against a contained region, e.g. es-419 (Latin America) matches es-MX (Mexico). - Add UnM49Data sourced from the CLDR territoryContainment data, parsed with XmlReader to keep the library AOT compatible, generated and embedded following the existing dataset pattern. - Add LanguageLookup.IsMatch(prefix, tag, regionContainment) as an opt-in overload; the existing two argument IsMatch is unchanged. - Add LanguageLookup.ExpandRegion to expand a region into its containing UN M.49 groups. - Fix ValidateExtendedLanguage to require 3 alpha so a numeric region following the language parses as a region, e.g. es-419. - Restore previously trimmed control flow comments in the parser and lookup. - Update README and HISTORY, add UN M.49 references, bump version to 1.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Adds UN M.49 (CLDR territoryContainment) region containment support to the LanguageTags library so numeric region groups (e.g., 419) can be matched against contained regions (e.g., MX), and enables region expansion to ancestor group regions.

Changes:

Introduces UnM49Data (XML loader + JSON/codegen + embedded generated dataset) sourced from Unicode CLDR territory containment.
Adds LanguageLookup.IsMatch(prefix, tag, regionContainment) overload and LanguageLookup.ExpandRegion() for containment-based matching/expansion.
Fixes parsing so extlang requires 3ALPHA, ensuring numeric regions like es-419 parse as a region.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.json	Bumps library version to 1.4.
README.md	Documents UN M.49 containment matching and region expansion; updates links and release-notes snippet.
HISTORY.md	Adds 1.4 release entry describing containment support and parser fix.
LanguageTagsCreate/CreateTagData.cs	Extends codegen pipeline to download/convert/generate UN M.49 data and code.
LanguageTags/UnM49Data.cs	Implements UN M.49 loader (XmlReader), JSON serialization, code generation, and query APIs (Find/Contains/GetAncestors).
LanguageTags/UnM49DataGen.cs	Adds generated embedded UN M.49 dataset used by `UnM49Data.Create()`.
LanguageData/unm49.json	Adds generated JSON form of the UN M.49 dataset.
LanguageTags/LanguageSchema.cs	Registers `UnM49Data` in the source-generated `JsonSerializerContext`.
LanguageTags/LanguageLookup.cs	Adds containment-aware matching overload and `ExpandRegion()`; wires in UN M.49 dataset usage.
LanguageTags/LanguageTagParser.cs	Tightens `extlang` validation to `3ALPHA` so numeric regions don’t misparse as extlang; restores control-flow comments.
LanguageTagsTests/UnM49Tests.cs	Adds tests for UN M.49 dataset loading/round-tripping and basic query behavior.
LanguageTagsTests/LanguageLookupTests.cs	Adds tests for containment matching (directional + opt-in) and `ExpandRegion()`.

- Region containment matching now substitutes the candidate region and reuses the plain matcher, preserving variant, extension, and private use semantics to avoid false positives, e.g. es-419-nedis no longer matches es-MX while es-419 still matches es-MX-nedis. - Clarify UnM49Data.Find returns the first of possibly multiple records for a code, and point to GetAncestors/Contains for full transitive containment. - Clarify UnM49Record.Code may be an alphabetic CLDR grouping code (EU, EZ, UN). - Add region containment tests for script preservation and prefix variants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Release: promote develop to main - UN M.49 region containment (#193, version floor 1.4) - Release-workflow fixes re-synced from template (#196: #213/#214/#217) Conflicts in three workflow files were the parallel setup-dotnet dependabot bump (identical on both branches); resolved to develop's authoritative versions (newer template re-sync + the workflow fixes).

ptr727 · 2026-06-26T16:11:22Z

Resolves#175.

What

Matching a UN M.49 region group against a contained region now works, e.g. es-419 (Latin America and the Caribbean) matches es-MX (Mexico).

Changes

New UnM49Data dataset sourced from Unicode CLDR territoryContainment, parsed with XmlReader (reflection-free, keeps the library AOT compatible — XmlSerializer is avoided), then JSON converted and code generated following the existing ISO/RFC dataset pattern.
LanguageLookup.IsMatch(prefix, tag, regionContainment) — opt-in overload. The existing two-argument IsMatch is unchanged and delegates with regionContainment: false, so there is no behaviour change and no extra work in the default path. Matching is directional: the broad group in the prefix matches the specific region in the tag, not the reverse.
LanguageLookup.ExpandRegion — expands a tag region into the tag plus a variant per containing UN M.49 group, e.g. es-MX → es-013, es-419, es-019, es-001.
Parser fix — ValidateExtendedLanguage now requires 3 alpha per RFC 5646 (extlang = 3ALPHA), so a numeric region following the language parses as a region instead of an extended language, e.g. es-419.
Restored previously trimmed control-flow comments in the parser and lookup.
Docs: README usage example + references, HISTORY entry, version.json bumped to 1.4.

Design notes

419 is a grouping="true" overlay in CLDR (not a canonical tree node), so the loader keeps grouping overlays and skips only status="deprecated" entries — dropping overlays would remove 419 entirely.
001 (World) is the universal ancestor, so es-001 matches any es tag with a region; documented in the API and covered by a test.

Testing

New UnM49Tests (dataset round-trip, Find, Contains, GetAncestors) and LanguageLookupTests theories covering the containment matching and ExpandRegion, including the directional and backward-compatibility cases.
Full suite: 293/293 passing. Build clean with AOT reference verification enabled.

🤖 Generated with Claude Code

Resolve#175 - match a UN M.49 region group against a contained region, e.g. es-419 (Latin America) matches es-MX (Mexico). - Add UnM49Data sourced from the CLDR territoryContainment data, parsed with XmlReader to keep the library AOT compatible, generated and embedded following the existing dataset pattern. - Add LanguageLookup.IsMatch(prefix, tag, regionContainment) as an opt-in overload; the existing two argument IsMatch is unchanged. - Add LanguageLookup.ExpandRegion to expand a region into its containing UN M.49 groups. - Fix ValidateExtendedLanguage to require 3 alpha so a numeric region following the language parses as a region, e.g. es-419. - Restore previously trimmed control flow comments in the parser and lookup. - Update README and HISTORY, add UN M.49 references, bump version to 1.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Adds UN M.49 (CLDR territoryContainment) region containment support to the LanguageTags library so numeric region groups (e.g., 419) can be matched against contained regions (e.g., MX), and enables region expansion to ancestor group regions.

Changes:

Introduces UnM49Data (XML loader + JSON/codegen + embedded generated dataset) sourced from Unicode CLDR territory containment.
Adds LanguageLookup.IsMatch(prefix, tag, regionContainment) overload and LanguageLookup.ExpandRegion() for containment-based matching/expansion.
Fixes parsing so extlang requires 3ALPHA, ensuring numeric regions like es-419 parse as a region.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.json	Bumps library version to 1.4.
README.md	Documents UN M.49 containment matching and region expansion; updates links and release-notes snippet.
HISTORY.md	Adds 1.4 release entry describing containment support and parser fix.
LanguageTagsCreate/CreateTagData.cs	Extends codegen pipeline to download/convert/generate UN M.49 data and code.
LanguageTags/UnM49Data.cs	Implements UN M.49 loader (XmlReader), JSON serialization, code generation, and query APIs (Find/Contains/GetAncestors).
LanguageTags/UnM49DataGen.cs	Adds generated embedded UN M.49 dataset used by `UnM49Data.Create()`.
LanguageData/unm49.json	Adds generated JSON form of the UN M.49 dataset.
LanguageTags/LanguageSchema.cs	Registers `UnM49Data` in the source-generated `JsonSerializerContext`.
LanguageTags/LanguageLookup.cs	Adds containment-aware matching overload and `ExpandRegion()`; wires in UN M.49 dataset usage.
LanguageTags/LanguageTagParser.cs	Tightens `extlang` validation to `3ALPHA` so numeric regions don’t misparse as extlang; restores control-flow comments.
LanguageTagsTests/UnM49Tests.cs	Adds tests for UN M.49 dataset loading/round-tripping and basic query behavior.
LanguageTagsTests/LanguageLookupTests.cs	Adds tests for containment matching (directional + opt-in) and `ExpandRegion()`.

- Region containment matching now substitutes the candidate region and reuses the plain matcher, preserving variant, extension, and private use semantics to avoid false positives, e.g. es-419-nedis no longer matches es-MX while es-419 still matches es-MX-nedis. - Clarify UnM49Data.Find returns the first of possibly multiple records for a code, and point to GetAncestors/Contains for full transitive containment. - Clarify UnM49Record.Code may be an alphabetic CLDR grouping code (EU, EZ, UN). - Add region containment tests for script preservation and prefix variants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Release: promote develop to main - UN M.49 region containment (#193, version floor 1.4) - Release-workflow fixes re-synced from template (#196: #213/#214/#217) Conflicts in three workflow files were the parallel setup-dotnet dependabot bump (identical on both branches); resolved to develop's authoritative versions (newer template re-sync + the workflow fixes).

ptr727 · 2026-06-26T16:11:22Z

Resolves#175.

What

Matching a UN M.49 region group against a contained region now works, e.g. es-419 (Latin America and the Caribbean) matches es-MX (Mexico).

Changes

New UnM49Data dataset sourced from Unicode CLDR territoryContainment, parsed with XmlReader (reflection-free, keeps the library AOT compatible — XmlSerializer is avoided), then JSON converted and code generated following the existing ISO/RFC dataset pattern.
LanguageLookup.IsMatch(prefix, tag, regionContainment) — opt-in overload. The existing two-argument IsMatch is unchanged and delegates with regionContainment: false, so there is no behaviour change and no extra work in the default path. Matching is directional: the broad group in the prefix matches the specific region in the tag, not the reverse.
LanguageLookup.ExpandRegion — expands a tag region into the tag plus a variant per containing UN M.49 group, e.g. es-MX → es-013, es-419, es-019, es-001.
Parser fix — ValidateExtendedLanguage now requires 3 alpha per RFC 5646 (extlang = 3ALPHA), so a numeric region following the language parses as a region instead of an extended language, e.g. es-419.
Restored previously trimmed control-flow comments in the parser and lookup.
Docs: README usage example + references, HISTORY entry, version.json bumped to 1.4.

Design notes

419 is a grouping="true" overlay in CLDR (not a canonical tree node), so the loader keeps grouping overlays and skips only status="deprecated" entries — dropping overlays would remove 419 entirely.
001 (World) is the universal ancestor, so es-001 matches any es tag with a region; documented in the API and covered by a test.

Testing

New UnM49Tests (dataset round-trip, Find, Contains, GetAncestors) and LanguageLookupTests theories covering the containment matching and ExpandRegion, including the directional and backward-compatibility cases.
Full suite: 293/293 passing. Build clean with AOT reference verification enabled.

🤖 Generated with Claude Code

Resolve#175 - match a UN M.49 region group against a contained region, e.g. es-419 (Latin America) matches es-MX (Mexico). - Add UnM49Data sourced from the CLDR territoryContainment data, parsed with XmlReader to keep the library AOT compatible, generated and embedded following the existing dataset pattern. - Add LanguageLookup.IsMatch(prefix, tag, regionContainment) as an opt-in overload; the existing two argument IsMatch is unchanged. - Add LanguageLookup.ExpandRegion to expand a region into its containing UN M.49 groups. - Fix ValidateExtendedLanguage to require 3 alpha so a numeric region following the language parses as a region, e.g. es-419. - Restore previously trimmed control flow comments in the parser and lookup. - Update README and HISTORY, add UN M.49 references, bump version to 1.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Adds UN M.49 (CLDR territoryContainment) region containment support to the LanguageTags library so numeric region groups (e.g., 419) can be matched against contained regions (e.g., MX), and enables region expansion to ancestor group regions.

Changes:

Introduces UnM49Data (XML loader + JSON/codegen + embedded generated dataset) sourced from Unicode CLDR territory containment.
Adds LanguageLookup.IsMatch(prefix, tag, regionContainment) overload and LanguageLookup.ExpandRegion() for containment-based matching/expansion.
Fixes parsing so extlang requires 3ALPHA, ensuring numeric regions like es-419 parse as a region.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.json	Bumps library version to 1.4.
README.md	Documents UN M.49 containment matching and region expansion; updates links and release-notes snippet.
HISTORY.md	Adds 1.4 release entry describing containment support and parser fix.
LanguageTagsCreate/CreateTagData.cs	Extends codegen pipeline to download/convert/generate UN M.49 data and code.
LanguageTags/UnM49Data.cs	Implements UN M.49 loader (XmlReader), JSON serialization, code generation, and query APIs (Find/Contains/GetAncestors).
LanguageTags/UnM49DataGen.cs	Adds generated embedded UN M.49 dataset used by `UnM49Data.Create()`.
LanguageData/unm49.json	Adds generated JSON form of the UN M.49 dataset.
LanguageTags/LanguageSchema.cs	Registers `UnM49Data` in the source-generated `JsonSerializerContext`.
LanguageTags/LanguageLookup.cs	Adds containment-aware matching overload and `ExpandRegion()`; wires in UN M.49 dataset usage.
LanguageTags/LanguageTagParser.cs	Tightens `extlang` validation to `3ALPHA` so numeric regions don’t misparse as extlang; restores control-flow comments.
LanguageTagsTests/UnM49Tests.cs	Adds tests for UN M.49 dataset loading/round-tripping and basic query behavior.
LanguageTagsTests/LanguageLookupTests.cs	Adds tests for containment matching (directional + opt-in) and `ExpandRegion()`.

- Region containment matching now substitutes the candidate region and reuses the plain matcher, preserving variant, extension, and private use semantics to avoid false positives, e.g. es-419-nedis no longer matches es-MX while es-419 still matches es-MX-nedis. - Clarify UnM49Data.Find returns the first of possibly multiple records for a code, and point to GetAncestors/Contains for full transitive containment. - Clarify UnM49Record.Code may be an alphabetic CLDR grouping code (EU, EZ, UN). - Add region containment tests for script preservation and prefix variants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Release: promote develop to main - UN M.49 region containment (#193, version floor 1.4) - Release-workflow fixes re-synced from template (#196: #213/#214/#217) Conflicts in three workflow files were the parallel setup-dotnet dependabot bump (identical on both branches); resolved to develop's authoritative versions (newer template re-sync + the workflow fixes).

ptr727 · 2026-06-26T16:11:22Z

Resolves#175.

What

Matching a UN M.49 region group against a contained region now works, e.g. es-419 (Latin America and the Caribbean) matches es-MX (Mexico).

Changes

New UnM49Data dataset sourced from Unicode CLDR territoryContainment, parsed with XmlReader (reflection-free, keeps the library AOT compatible — XmlSerializer is avoided), then JSON converted and code generated following the existing ISO/RFC dataset pattern.
LanguageLookup.IsMatch(prefix, tag, regionContainment) — opt-in overload. The existing two-argument IsMatch is unchanged and delegates with regionContainment: false, so there is no behaviour change and no extra work in the default path. Matching is directional: the broad group in the prefix matches the specific region in the tag, not the reverse.
LanguageLookup.ExpandRegion — expands a tag region into the tag plus a variant per containing UN M.49 group, e.g. es-MX → es-013, es-419, es-019, es-001.
Parser fix — ValidateExtendedLanguage now requires 3 alpha per RFC 5646 (extlang = 3ALPHA), so a numeric region following the language parses as a region instead of an extended language, e.g. es-419.
Restored previously trimmed control-flow comments in the parser and lookup.
Docs: README usage example + references, HISTORY entry, version.json bumped to 1.4.

Design notes

419 is a grouping="true" overlay in CLDR (not a canonical tree node), so the loader keeps grouping overlays and skips only status="deprecated" entries — dropping overlays would remove 419 entirely.
001 (World) is the universal ancestor, so es-001 matches any es tag with a region; documented in the API and covered by a test.

Testing

New UnM49Tests (dataset round-trip, Find, Contains, GetAncestors) and LanguageLookupTests theories covering the containment matching and ExpandRegion, including the directional and backward-compatibility cases.
Full suite: 293/293 passing. Build clean with AOT reference verification enabled.

🤖 Generated with Claude Code

Resolve#175 - match a UN M.49 region group against a contained region, e.g. es-419 (Latin America) matches es-MX (Mexico). - Add UnM49Data sourced from the CLDR territoryContainment data, parsed with XmlReader to keep the library AOT compatible, generated and embedded following the existing dataset pattern. - Add LanguageLookup.IsMatch(prefix, tag, regionContainment) as an opt-in overload; the existing two argument IsMatch is unchanged. - Add LanguageLookup.ExpandRegion to expand a region into its containing UN M.49 groups. - Fix ValidateExtendedLanguage to require 3 alpha so a numeric region following the language parses as a region, e.g. es-419. - Restore previously trimmed control flow comments in the parser and lookup. - Update README and HISTORY, add UN M.49 references, bump version to 1.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Adds UN M.49 (CLDR territoryContainment) region containment support to the LanguageTags library so numeric region groups (e.g., 419) can be matched against contained regions (e.g., MX), and enables region expansion to ancestor group regions.

Changes:

Introduces UnM49Data (XML loader + JSON/codegen + embedded generated dataset) sourced from Unicode CLDR territory containment.
Adds LanguageLookup.IsMatch(prefix, tag, regionContainment) overload and LanguageLookup.ExpandRegion() for containment-based matching/expansion.
Fixes parsing so extlang requires 3ALPHA, ensuring numeric regions like es-419 parse as a region.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.json	Bumps library version to 1.4.
README.md	Documents UN M.49 containment matching and region expansion; updates links and release-notes snippet.
HISTORY.md	Adds 1.4 release entry describing containment support and parser fix.
LanguageTagsCreate/CreateTagData.cs	Extends codegen pipeline to download/convert/generate UN M.49 data and code.
LanguageTags/UnM49Data.cs	Implements UN M.49 loader (XmlReader), JSON serialization, code generation, and query APIs (Find/Contains/GetAncestors).
LanguageTags/UnM49DataGen.cs	Adds generated embedded UN M.49 dataset used by `UnM49Data.Create()`.
LanguageData/unm49.json	Adds generated JSON form of the UN M.49 dataset.
LanguageTags/LanguageSchema.cs	Registers `UnM49Data` in the source-generated `JsonSerializerContext`.
LanguageTags/LanguageLookup.cs	Adds containment-aware matching overload and `ExpandRegion()`; wires in UN M.49 dataset usage.
LanguageTags/LanguageTagParser.cs	Tightens `extlang` validation to `3ALPHA` so numeric regions don’t misparse as extlang; restores control-flow comments.
LanguageTagsTests/UnM49Tests.cs	Adds tests for UN M.49 dataset loading/round-tripping and basic query behavior.
LanguageTagsTests/LanguageLookupTests.cs	Adds tests for containment matching (directional + opt-in) and `ExpandRegion()`.

- Region containment matching now substitutes the candidate region and reuses the plain matcher, preserving variant, extension, and private use semantics to avoid false positives, e.g. es-419-nedis no longer matches es-MX while es-419 still matches es-MX-nedis. - Clarify UnM49Data.Find returns the first of possibly multiple records for a code, and point to GetAncestors/Contains for full transitive containment. - Clarify UnM49Record.Code may be an alphabetic CLDR grouping code (EU, EZ, UN). - Add region containment tests for script preservation and prefix variants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Release: promote develop to main - UN M.49 region containment (#193, version floor 1.4) - Release-workflow fixes re-synced from template (#196: #213/#214/#217) Conflicts in three workflow files were the parallel setup-dotnet dependabot bump (identical on both branches); resolved to develop's authoritative versions (newer template re-sync + the workflow fixes).

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Comment threadLanguageTags/UnM49Data.cs
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Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
998c01f
"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
998c01f
"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Comment threadLanguageTags/LanguageLookup.cs
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Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
998c01f
"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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ptr727 merged commit 10cc912 into developJun 26, 2026
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Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
998c01f
"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
998c01f
"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
998c01f
"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
998c01f
"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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ptr727 merged commit 10cc912 into developJun 26, 2026
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ptr727 deleted the feature/unm49-containment-175 branch June 26, 2026 16:53

ptr727 mentioned this pull request Jun 26, 2026
Release: promote develop to main #197
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This was referenced Jun 29, 2026
Bump the nuget-deps group with 2 updates ptr727/PlexCleaner#775
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Bump the nuget-deps group with 2 updates ptr727/PlexCleaner#776
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Comment threadLanguageTags/LanguageLookup.cs
Comment threadLanguageTags/LanguageLookup.cs Outdated
Comment threadLanguageTags/UnM49Data.cs
Comment threadLanguageTags/UnM49Data.cs

ptr727 requested a review from Copilot June 26, 2026 16:39

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Comment threadLanguageTags/LanguageLookup.cs
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Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
998c01f
"variant" has a specific RFC 5646 meaning, so describe the expanded entries as region substituted tags instead, in the XML doc and README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

ptr727 requested a review from Copilot June 26, 2026 16:44

Copilotstarted reviewing on behalf of ptr727 June 26, 2026 16:45 View session

CopilotAI reviewed Jun 26, 2026
View reviewed changes

ptr727 merged commit 10cc912 into developJun 26, 2026
12 checks passed

ptr727 deleted the feature/unm49-containment-175 branch June 26, 2026 16:53

ptr727 mentioned this pull request Jun 26, 2026
Release: promote develop to main #197
Merged

This was referenced Jun 29, 2026
Bump the nuget-deps group with 2 updates ptr727/PlexCleaner#775
Merged
Bump the nuget-deps group with 2 updates ptr727/PlexCleaner#776
Merged

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ptr727 commented Jun 26, 2026

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ptr727 commented Jun 26, 2026

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