I think we are pretty close to saying the same thing. You are correct that "undef" may not lead to a warning. Also correct that -w on the shebang line may cause other warnings..

I have found that the simple: use warnings or -w is about the right idea and that FATAL would be wrong...This is ok for testing, but once an application is "out in the wild", I don't think so.

In reply to Re^5: Modifying Arrays passed by reference to subroutine by Marshall
in thread Modifying Arrays passed by reference to subroutine by sadarax

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