The simple answer is that it is a bug in Perl.
Looking at perl.c shows that PERL5OPT is mostly processed
via PERL_moreswitches() which mentions:
/* We allow -M'Module qw(Foo Bar)' */
which seems strange. My guess is that PERL_moreswitches()
was "enhanced" to allow this new usage by someone who didn't
realize how this badly breaks #! and PERL5OPT.
(who wishes he had a revision-controlled copy of the Perl source)
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