[elycruz]

Summary

Adds the missing half of #89: charRange, a generator in src/string/charRange.ts, plus a curried $charRange. numRange already landed.

Array.from(charRange('a', 'e'));    // ['a', 'b', 'c', 'd', 'e']
Array.from(charRange('a', 'e', 2)); // ['a', 'c', 'e']
Array.from(charRange('c', 'a'));    // ['c', 'b', 'a']

It's built on numRange, so the range is inclusive and step is normalized the same way. It steps by code point, so characters outside the BMP work. Passing anything other than a single character throws. Without that check, an empty string would make codePointAt return undefined, and numRange would silently use its default range.

Closes #89

Testing

• New tests/string/test-charRange.ts, and a $charRange entry in the tests/test-currying.ts registry
• pnpm test: 134 suites and 1478 tests pass
• npx tsc --noEmit -p packages/fjl/tsconfig.json: clean
• pnpm build: succeeds, and charRange works from dist/cjs/index.cjs
• eslint on changed files: clean

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