I really don't understand your example. I substituted warns with prints:
use strict;
use warnings;
my $re =qr{a};
my $re2 =qr{a};
print $re == $re2,"\n";
print $re2 == $re2,"\n";
print 0+$re,"\n";
print 0+$re2,"\n";
and this is the result:
sini@ordinalfabetix:~$ ./x.pl
1
135589228
135591376
sini@ordinalfabetix:~$
The last two lines are NOT equal, because are references to two different scalars. And, as a consequence, $re != $re2 (and $re == $re, but it was expected).
So numerical comparison doesn't tell you if two regex are equal, but only if they are the same (reference).
Rule One: "Do not act incautiously when confronting a little bald wrinkly smiling man."
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