In this example %required doesn't need to be a hash, and since that's what you're checking against, that's what you should search. You could also use prototyping to avoid building a whole new hash each time, so we'd end up with something like:
sub test_it (\%) {
my ($h) = @_;
return (keys (%$h) >= @required
&& !grep { !defined($h->{$_}) } @required);
# return true if the list of missing required keys is empty
}
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