If for some reason $| = -1,...
No. Please don't make assertions like that
when you haven't tested them.
$| is magic. It always equals either zero or one.
Nothing else. Behold:
print "$|\n"; # 0
$| = -1;
print "$|\n"; # 1
$|++;
print "$|\n"; # 1
$|++;
print "$|\n"; # 1
$|--;
print "$|\n"; # 0
$|--;
print "$|\n"; # 1
$|--;
print "$|\n"; # 0
As you can see, $|++ always sets $| to one
(no matter what it was) and $|--
always toggles it.
I agree that $| = 1; is more clear to
newer programmers.
But rationalle for that usage has
to do with the learning curve
and not with the behavior of $|.
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