A for loop typically returns nothing, whatever that means...
Judging by your results on the warnings, or rather the lack of them, I think the subs return false, thus, !1. That is both equal to "" and numerically equal to 0 without a warning.
Oh, and a 1 is allowed to be used as a statement without warning. Typical use for them is in a bodyless loop:
1 while COND;
as well as as the last statement in a required file/module. Hence that there's no warning for a bare 1;.
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