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Delivered as part of version 5.1
If the information is available, then it might make sense to use an already existing builtin to return it, and, yes, it would be very useful to return this information also for other conversion conditions!
The offending character is already returned by the ONCHAR built-in function.
We could also use the ONSUBCODE built-in function to return the index of this character. The only question is whether we should do this just for the HEXDECODE built-in function or for all conversion conditions, and we are leaning to the latter.