Just that you should be really sure that that's what you want to do.

And when would it be what you want to do? No, ->isa is always the way to go. Feel free to wrap it in an eval if you need. 

my $isa = eval { $questionable->isa($class) };

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In reply to Re^2: Do not use UNIVERSAL::isa this way; but why? by ikegami
in thread Do not use UNIVERSAL::isa this way; but why? by klekker

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