The catch is that as soon as that section uses a parameter or a global, it has no chance to know whether there will be any magic!

Does

sub addOne {
  my ($num) = @_;
  return $num + 1;
}
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need any magic? No? So what happens if I pass the subroutine a tie()d variable?

I'd like to ask the OP to restrict himself to a recent version of English if he decides to reply. His attempts at old English are funny for two sentences, boring for ten and right away annoying for longer posts.)