Actually, the same is true of zero:
% perl -wce 0
-e syntax OK
Yes, thank you, and also of undef and (), and of any list whose elements are the scalars already identified; e.g.:
% perl -wce '( 1, 0, undef, , "di foo", "ds bar", "ig baz" )'
-e syntax OK
Given dave_the_m's explanation above, is this to allow:
0 until ....
Reading between the lines, I gather that you are attaching some significance to the boolean value of the constant in question. I did too on a first reading, but then I realized that it is the boolean value of what follows the while or until that matters. I.e.,
1 while some_condition_with_side_effects;
has the same effect as
0 while some_condition_with_side_effects;
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