The new isa operator in Perl 5.32 is pretty great, but if you need to support legacy versions of Perl, you can't use it yet. This module gives you isa-like functions you can use in Perl 5.6 and above. If you've got Type::Tiny::XS installed, you will probably find that this module is faster than the native isa operator! The functions exported respect inheritance and allow classes to override their isa method as you'd expect.