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fix(vocabularies): fix various English plurals - #1968

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jimcullenaus:fix-plurals
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fix(vocabularies): fix various English plurals#1968
jimcullenaus wants to merge 4 commits into
Humanizr:mainfrom
jimcullenaus:fix-plurals

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@jimcullenaus jimcullenaus commented Sep 8, 2026

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including -ium and -us stems, reflexive pronouns, and elements

Fixes #1962, improving various plurals in English to use more widely-accepted or standardised options.

  • Various "-us" words changed from "-i" to "-uses"
  • Various "-um" words, including many chemical elements, changed from "-a" to "-ums"
  • Reflexive pronouns changed to have no plural

See #1962 for discussion of the reasoning behind these.

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Summary by CodeRabbit

  • Bug Fixes
    • Improved pluralization and singularization for additional Latin- and Greek-derived word forms.
    • Added recognition for alternate plurals such as “octopodes,” “spandices,” and “-a” forms of selected “-ium” nouns.
    • Corrected default plurals for “octopus” and “hippopotamus.”
    • Improved handling of irregular forms, including “spandex” and reflexive pronouns.
    • Added chemical-element vocabulary, including tellurium and thallium.
    • Chemical element names ending in “-ium” are now treated as uncountable nouns.

including -ium and -us stems, reflexive pronouns, and elements
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No actionable comments were generated in the recent review. 🎉

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📒 Files selected for processing (1)
  • src/Humanizer/Inflections/Vocabularies.cs
🚧 Files skipped from review as they are similar to previous changes (1)
  • src/Humanizer/Inflections/Vocabularies.cs

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📝 Walkthrough

Walkthrough

The inflection vocabulary now includes chemical elements and reflexive pronouns as uncountable terms. Pluralization and singularization rules support additional English, Latin, and Greek forms. Tests cover alternate plurals and updated default results.

Changes

Inflection updates

Layer / File(s) Summary
Inflection vocabulary and rules
src/Humanizer/Inflections/Vocabularies.cs
Adds chemical-element names, uncountable reflexive pronouns, alternate singularization rules, and irregular plural mappings for selected nouns.
Inflection behavior tests
tests/Humanizer.Tests/InflectorTests.cs
Adds coverage for alternate plurals, chemical-element uncountability, reflexive pronouns, and updated octopus and hippopotamus plurals.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~15 minutes

Severity of issue fixed: Medium

Merge Risk: 🟡 Moderate · up to 16b39

Pluralization behavior for self and yourself may not match the newly expected results, leaving incorrect inflection output until the vocabulary and tests are aligned.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 2 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and concisely describes the primary change: correcting English pluralization rules in vocabularies.
Linked Issues check ✅ Passed The changes address the requirements in issue [#1962]. They update preferred plurals for the listed -us, -ium/-um, and -dex words; mark relevant chemical elements and reflexive pronouns as uncountable…
Out of Scope Changes check ✅ Passed The vocabulary changes and related tests are within the scope of issue [#1962]. No unrelated code changes are identified.
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Reviewed commit: cbe861d239

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Comment thread src/Humanizer/Inflections/Vocabularies.cs

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Actionable comments posted: 3

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Inline comments:
In `@src/Humanizer/Inflections/Vocabularies.cs`:
- Line 96: Add “tellurium” to the UncountableChemicalElementNames vocabulary and
add an independent regression test that verifies tellurium remains uncountable
and is not pluralized as “telluria.”
- Around line 237-241: Add explicit singularization aliases for himselves,
herselves, itselves, myselves, and oneselves in the vocabulary configuration,
mapping each to its corresponding singular reflexive form. Place these rules
before the generic trailing-s rule so they take precedence, while preserving the
existing AddUncountable entries.

In `@tests/Humanizer.Tests/InflectorTests.cs`:
- Around line 726-727: Update BuildDefault to add exact irregular plural
mappings for “self” to “selves” and “yourself” to “yourselves”, using
matchEnding: false so only those exact words are matched.

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Reviewing files that changed from the base of the PR and between ffc2b77 and cbe861d.

📒 Files selected for processing (2)
  • src/Humanizer/Inflections/Vocabularies.cs
  • tests/Humanizer.Tests/InflectorTests.cs

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Comment thread src/Humanizer/Inflections/Vocabularies.cs
Comment thread src/Humanizer/Inflections/Vocabularies.cs
Comment thread tests/Humanizer.Tests/InflectorTests.cs
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Various non-standard and incorrect plurals are currently in use

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