[Plastic-time]

isAlpha and isAlphanumeric currently turn the literal string option ignore: 's' into the regexp whitespace class. For example, isAlpha('ab cd', 'en-US', {ignore: 's'}) incorrectly returns true, while a literal s embedded in a Russian string is not removed.

Remove the stray s from both regexp-escaping character classes. String ignore options now remove the requested literal character; explicit whitespace, regexp metacharacters, and RegExp-valued options retain their behavior. This restores the existing README contract and introduces no API or locale-table change.

Validation on Node 24.20.0 / Windows:

• Built unchanged source and ran the new Mocha regression file: four intended failures and four compatibility passes.
• npm test after the fix: Node/ES/browser/minified builds, ESLint, and all 331 tests pass.
• Independent agent review exercised 33,848 additional character-option checks across Node, UMD, minified UMD and ESM generated forms. The browser bundles were evaluated in Node; this is not a claim of a full browser CI run.

Duplicate check: open #2086 and #2087 refactor option signatures but retain the original escaping expression; their actual diffs do not fix this case. Latest master was checked before submission.

AI assisted the implementation and this description; a separate agent reviewed the final diff and tried counterexamples. No human review is claimed.

Checklist

• PR contains only related source changes and regression tests; no generated files.
• README reviewed; its existing literal-ignore contract is unchanged.
• Tests written and verified to fail before the fix.
• References provided where applicable: existing README API contract and related PR comparison above; no format-data update.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9ff3424) to head (aa51526).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2938   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          114       114           
  Lines         2599      2599           
  Branches       658       658           
=========================================
  Hits          2599      2599           

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