If you want clean function overloading in Perl take a look at Class::Multimethods.
There's also the appropriately named overload module, which I have yet to use but looks interesting.
Update: Here's an example with Class::Multimethods:
use Class::Multimethods;
multimethod add => ('#', '#')
=> sub { $ans = $_[0] + $_[1]; print $ans, "\n" };
multimethod add => ('$', '$')
=> sub { $ans = $_[0] . $_[1]; print $ans, "\n" };
add(1, 2);
add("Foo", "Bar");
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