can this ancient octal feature of perl be switched off ?
I don't think so (and BTW, octals are still useful today in e.g. chmod).
But it sounds more like an XY Problem to me - it appears you're generating Perl source code. If you're doing that, why not generate the numbers as strings instead? When converting strings to numbers, leading zeros are ignored.
$ perl -wMstrict -le 'print 0+"023"'
23
Could you show the code that is generating your Perl code? I curious why there is need to chop numbers up and then interpret them as integers instead of strings.
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