I use #!perl -w only in the test suite.
This way, users can decide whether to enable warnings or not.

Update: as I understand from perlrun, a shebang line in a module would not be interpreted at all.

In reply to Re: Re: Migrating scripts back to Perl 5.005_03 by fglock
in thread Migrating scripts back to Perl 5.005_03 by fglock

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