For recent enough perls the smartmatch ~~ operator

Smart matching was retroactively documented as experimental since v5.16 (2012), and once in a while there are discussions on P5P on completely overhauling its behavior. I wouldn't recommend it, as code relying on it may break on newer versions of Perl. As of v5.18 using it will generate warnings about its experimental status.

I also mentioned that the behavior of == can be changed with operator overloading in my other replies in this thread.