Interesting... very interesting. So what happens for values that are both numbers and strings? I just ran your is_number() trick against a string/number variable (actually a PVIV) and it correctly reported that there it's a number... it just also happens to be a string.

use Devel::Peek;
$a = 0;
scalar "$a";

Dump($a); # prove it's a PVIV with IOK and POK set
print is_number($a); # returns true

sub is_number { ( $_[0] & ~ $_[0] ) eq '0' }

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In reply to Re: DBI: when 1 != '1' by diotalevi
in thread DBI: when 1 != '1' by IlyaM

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