Care to explain what you mean that it won't handle zeros?

I think he's referring to the discrepancy between the documented behaviour (returning the sign of the number) and the actual behaviour (returning 0) for both positive and negative zeros. 

$ perl -le'$x=+0.0; print $x; print $x<=>0'
0
0

$ perl -le'$x=-0.0; print $x; print $x<=>0'
-0
0

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It does produce the documented results for +inf and -inf, and a sane result for NaN. 

$ perl -wle'$x=0+Infinity; print $x; print $x<=>0'
inf
1

$ perl -wle'$x=0-Infinity; print $x; print $x<=>0'
-inf
-1

$ perl -wle'$x=0+NaN; print $x; print $x<=>0'
nan
Use of uninitialized value in print at -e line 1.

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In reply to Re^3: Spaceship Zero by ikegami
in thread Spaceship Zero by Orchew

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