thai_id_utils

https://github.com/chayuto/thai_id_utils

Zero-dependency Ruby utilities for Thai national ID numbers: • checksum validation (modulus-11), • component decoding (category, province, district, sequence), • province-constrained valid ID generation with DISTRICT_COUNTS, • province name lookup for all 77 provinces, • laser ID validation, decoding, and generation, • human-readable category descriptions (0–8), • Buddhist Era ↔ Common Era date conversion.