On Mon, 2026-07-13 at 13:20 -0400, Tom Lane wrote:
> I wrote:
> > Well, there aren't going to be any ASCII characters that produce 12
> > bytes, and probably not any LATIN1 characters either, so I think we
> > could assume that the shortest input character that could produce
> > such a long output would be 3 bytes.
>
> Ah sorry, I should have written BMP not LATIN1. Maybe it still holds
> across that set, but I'm less sure.
Attached a patch. I added some perl code to check that the expansion
factor of the UTF8 representation doesn't exceed 3, and added a static
assert in the C code to compare to MaxAllocSize.
Regards,
Jeff Davis
