Fix PEP 8 naming violations: add `is_thai_char`/`is_thai`/`count_thai`; create `pythainlp.chunk` with `CRFChunkParser`; enforce private API boundaries#1339

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copilot/refactor-inconsistent-naming-conventions

Mar 19, 2026

Commits on Mar 15, 2026

Commits on Mar 16, 2026

Make internal helpers private; remove cross-module private imports

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