in reply to isa for ref?

It's documented towards the end of UNIVERSAL. And you don't want to do it. isa is a method, not a function.

toby döt ink

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Re^2: isa for ref?
by haj (Vicar) on Jun 21, 2020 at 12:49 UTC
    isa is a method, not a function.
    SCNR: Unless you're running Perl 5.32, where isa is an infix operator.
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