Inexplicit tests, eg `if ($var)`, will not differentiate between undef and 0. However, you should be able to explicitly test for either 0 or undef.
for (0, undef, 1) {
print "[$_] is true\n" if ($_);
print "[$_] is false\n" if (not $_);
print "[$_] is 0\n" if ($_ eq "0");
print "[$_] is undef\n" if (not defined $_);
}
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