It's worth mentioning this tidbit I picked up from HOP: '0 but true' is a special-case that will not issue a warning when used in a numeric context.
$ perl -we 'print "0 but true" + 2'
$ perl -we 'print "0 but actually true" + 2'
Argument "0 but actually true" isn't numeric in addition (+) at -e lin
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