bugfix: char class casefold for certain chars #20
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When a character is less than or equal to single byte size (0xff), yet it takes more than 1 byte in the current encoding, the case folding code incorrectly put it in bitset instead of code range. As a result, for utf8 encoding, casefold works incorrectly on characters in range \u0080 to \u00ff (latin1 supplement). Before fix: * `"\u00c2"` `[\u00e0-\u00e5]` returns false * `"\u00c2"` `[\u00e2]` returns false * `"\u00c2"` `\u00e2` returns true
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When a character is less than or equal to single byte size (0xff),
yet it takes more than 1 byte in the current encoding, the
case folding code incorrectly put it in bitset instead of code
range. As a result, for utf8 encoding, casefold works incorrectly
on characters in range \u0080 to \u00ff (latin1 supplement).
Before fix:
"\u00c2"[\u00e0-\u00e5]returns false"\u00c2"[\u00e2]returns false"\u00c2"\u00e2returns true