Tom Lane wrote:
There should somewhere be a block comment explaining all the reasoning
we've so painfully gone through about why the three cases (SB, MB, UTF8)
are needed and how they must differ.


I'm working on a detailed description/rationale.

However, I have just about convinced myself that we don't need IsFirstByte for matching "_" for UTF8, either preceded by "%" or not, as it should always be true. Can anyone come up with a counter example? I don't mind keeping it and using it in Assert() though.



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