note
etcshadow
The nitpick is perfectly valid... I almost made a note of it. Of course, it would be possible (though silly) to implement an abs function without a comparison, such as <code>sub abs { sqrt($_[0]**2) }</code>.
<p>
There's probably some mathematical identity for the abs of the difference of two numbers... but I didn't get enough sleep last night to think about what it might be :-)
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