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# Does not say "true". This is as you describe.
say "true" if undef, undef;

# Still doesn't say true.
say "true" if 1, 2, 3, 4, undef;

say "true" if 1, 2, 3, 4, undef;

sub x {
  1;
...
  return undef;
}
say "true" if x();