at_base2e15 library Null safety

The base2e15 library. Map 15 bits to unicode 0x0000 ~ 0x1935 -> U+3480 ~ U+4DB5 CJK Unified Ideographs Extension A 0x1936 ~ 0x545B -> U+4E00 ~ U+8925 CJK Unified Ideographs 0x545C ~ 0x7FFF -> U+AC00 ~ U+D7A3 Hangul Syllables 7 bits special case, only used by last character 0x00 ~ 0x7F -> U+3400 ~ U+347F CJK Unified Ideographs Extension A

Classes

Base2e15