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Functions related to UTF encoding.
||Checks whether an Unicode code point is a bidirectional control character.|
||Return !=0 if unicode alpha. Use table from C99 Appendix D.|
||Returns the code length of c in code units for the encoding. sz is the encoding: 1 = utf8, 2 = utf16, 4 = utf32.|
||Returns the code length of c in code units.|
||Decode a UTF-8 sequence as a single UTF-32 code point.|
||Decode a UTF-16 sequence as a single UTF-32 code point.|
||The Unicode code space is the range of code points [0x000000,0x10FFFF] except the UTF-16 surrogate pairs in the range [0xD800,0xDFFF]|