NextGraphemeBreakIn
public fn NextGraphemeBreakIn(ReadOnlySpan<uint8> bytes, int32 start, int32 end) : int32import NextGraphemeBreakIn from Wax;Finds the next extended grapheme-cluster boundary in a UTF-8 byte view. The caller supplies a valid starting boundary and an in-range exclusive end. Used by grapheme iteration rather than byte or code-point iteration.
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