What do you think about using UNIVERSAL::isa on unblessed reference. Is it safe (recommendable)?

# checking whether argument is a subroutine reference
if (!UNIVERSAL::isa($callback, 'CODE')){
}

# popping last option parameter
my $options_ref = @_ && UNIVERSAL::isa($_[-1], 'HASH')? pop(): {};

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

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