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According to Appendix A section 7 of the GAWK (GNU AWK) documentation (link), using \xNN to represent a character with the hex value 0xNN, is not part of the AWK standard (here). That said, the GAWK documentation page states that it is supported by gawk, mawk, and Brian Kernighan's awk, which it states are "the three most widely used freely available versions of awk". When testing for portability, I tested against those 3, as well as the BusyBox AWK implementation, which appears to also support the \xNN functionality, so I did not catch it.

The OCaml implementation uses a snippet from StackOverflow, which I credited properly.

The problem is that StackOverflow code snippets are CC-BY-SA license, which is not GPL compatible.

Need to rewrite the code snippet in question

That's true in the containerized environment I tested it in, but shouldn't may not be true in other cases.