Hack around module authors using UNIVERSAL::isa as a function
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Полное описание
Whenever you use "isa" in UNIVERSAL as a function, a kitten using
Test::MockObject dies. Normally, the kittens would be helpless, but
if they use UNIVERSAL::isa (the module whose docs you are reading),
the kittens can live long and prosper.
This module replaces UNIVERSAL::isa 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 UNIVERSAL::isa is just called directly.
