toke.c: scan_num: %c format to print a non digit byte

[khwilliamson]

This panic croak was wrong, should it ever get executed. Any byte that reaches it isn't a digit, so %d would give wrong results.

• This set of changes does not require a perldelta entry.

[tonycoz]

I think this is a bad change.

If the panic ever happens and *s contains some control character the resulting panic message will display something like panic: scan_num, *s= followed by a probably invisible control character.

The %d provides something that's visible to the user and can be more easily be reported.

It may be that the message is difficult to reproduce, so we can't depend on the user being able to capture the message in a file and extract its character code that way.