> Python can let objects be used as keys in dictionaries You can do this in perl too with a core (since perl 5.004) module. https://metacpan.org/pod/Tie::RefH

> Python can let objects be used as keys in dictionaries You can do this in perl too with a core (since perl 5.004) module. https://metacpan.org/pod/Tie::RefHash https://metacpan.org/pod/Tie::RefHash.