Tom Lane wrote:
3. UTF8: % can advance bytewise. _ must check it is on a first byte (else return match failure) and if so do NextChar. So primitives are NextChar, NextByte, ByteEq, IsFirstByte.
We should only be able to get out of step from the "%_" case, I believe, so we should only need to do the first-byte test in that case (which is in a different code path from the normal "_" case. Does that seem right?
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