I prefer 0+ over scalar. It's a little more self-documenting. 

my %h = (a=>1, b=>2);
print 0+keys(%h), "\n";

my @a = qw( a b c );
print 0+@a, "\n";

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In reply to Re: Wrong result for "length keys %$hashref"? by ikegami
in thread Wrong result for "length keys %$hashref"? by samwyse

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