esharris,
I can't reproduce your problem

$ perl -Mstrict -Mwarnings -e 'print "foo\n" if "two" == "two";'
Argument "two" isn't numeric in numeric eq (==) at -e line 1.
Argument "two" isn't numeric in numeric eq (==) at -e line 1.
foo
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The warning is useful since you should be using eq there, but it does indeed return true because those strings do have numerical equivalence when the treated that way.