EncodeUtf8
public fn EncodeUtf8(Span<uint8> dst, int32 w, uint32 cp) : int32import EncodeUtf8 from Wax;Writes a scalar as UTF-8 at byte offset w, returning its byte width. Invalid scalars become
U+FFFD. The caller must provide up to four writable bytes; insufficient space can panic after
partial writes.
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