See my response above to almut. While your Perl doesn't show it, mine shows a hardcoded difference in the behavior of PERL5LIB and use lib. And therefore there is every reason to believe saintmike's description.

In reply to Re^2: PERL5LIB different than 'use lib' by tilly
in thread PERL5LIB different than 'use lib' by saintmike

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