May 26, 2018

Try to recover from people calling UNIVERSAL::isa as a function

Whenever you use UNIVERSALisa as a function, a kitten using TestMockObject dies. Normally, the kittens would be helpless, but if they use UNIVERSALisa the module whose docs you are reading, the kittens can live long and prosper.

This module replaces UNIVERSALisa with a version that makes sure that if it’s called as a function on objects which override isa, isa will be called on those objects as a method.

In all other cases the real UNIVERSALisa is just called directly.

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