[nev21]

[Bug] Case helpers (strCamelCase, strKebabCase, strSnakeCase, strCapitalizeWords): case not normalised, inconsistent word boundaries, non-ASCII letters dropped
#634

[Copilot]

🟡 Changes recommended

Unresolved Unicode-handling bugs drop valid characters, create false word boundaries, and incorrectly normalize Greek final sigma during capitalization.

2 open issues

• Exclude letters, numbers, and marks from separator ranges · New
• Preserve final-sigma context when capitalizing words · New

What changed in this PR

This PR addresses #634 by improving word detection and non-ASCII handling in the library’s case helpers while retaining existing camel-case normalization and edge-separator behavior.

Changes:

• Introduces fixed-range word matching for non-ASCII text, acronym boundaries, and digit-to-uppercase transitions.
• Reduces allocations in native-function wrappers and uses shared method-name constants.
• Expands regression tests, documents output changes, and adjusts bundle-size limits.

File	Description
lib/​test/​src/​common/​string/​conversion.test.ts	Adds boundary, non-ASCII, compatibility, and round-trip tests.
lib/​test/​src/​common/​internal/​unwrapFunction.test.ts	Tests argument counts in wrapper error messages.
lib/​test/​bundle-size-check.js	Raises bundle-size thresholds.
lib/​src/​string/​upper_lower.ts	Uses shared case-conversion method constants.
lib/​src/​string/​substring.ts	Uses the shared substring method constant.
lib/​src/​string/​conversion.ts	Reworks word matching and case conversion; documents behavior.
lib/​src/​internal/​unwrapFunction.ts	Forwards arguments without slicing and expands error details.
lib/​src/​internal/​constants.ts	Adds shared string-method names.
CHANGELOG.md	Documents behavior changes and performance improvements.
.size-limit.json	Updates distribution-size budgets.

_{Review effort: Balanced}

[Copilot]

🟡 Changes recommended

Unresolved Unicode handling defects cause incorrect casing of supplementary-plane letters and inconsistent word boundaries for accented Greek capitals across normalization forms.

2 open issues

• Recognize accented Greek capitals as word boundaries · New
• Handle supplementary-plane characters in first-letter case conversion · New

2 resolved since last review

• Preserve final-sigma context when capitalizing words
• Exclude letters, numbers, and marks from separator ranges

_{Review effort: Balanced}

[Copilot]

🟡 Changes recommended

The new dispatch relies on the target method’s own call property, causing exceptions or incorrect invocation when it is overridden, and both affected wrappers need to use the intrinsic Function.prototype.call.

1 open issue

• Avoid dispatching through a method’s own call property · New

2 resolved since last review

• Handle supplementary-plane characters in first-letter case conversion
• Recognize accented Greek capitals as word boundaries

_{Review effort: Balanced}

[Copilot]

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[Copilot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.21%. Comparing base (49bffdb) to head (4bca651).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #636   +/-   ##
=======================================
  Coverage   99.21%   99.21%           
=======================================
  Files         180      180           
  Lines        5590     5630   +40     
  Branches     1262     1297   +35     
=======================================
+ Hits         5546     5586   +40     
  Misses         44       44           

Files with missing lines	Coverage Δ
lib/src/funcs/funcs.ts	100.00% <100.00%> (ø)
lib/src/internal/constants.ts	100.00% <100.00%> (ø)
lib/src/internal/unwrapFunction.ts	100.00% <100.00%> (ø)
lib/src/string/conversion.ts	100.00% <100.00%> (ø)
lib/src/string/substring.ts	100.00% <100.00%> (ø)
lib/src/string/upper_lower.ts	100.00% <100.00%> (ø)

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[nev21]

LGTM

[nevware21-bot]

Approved by nevware21-bot