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  1. or download this
    $x += 4;
or
$x->add_ui_gmp(4);
  2. or download this
    $x = $orig;
$x += 4; # $orig remains unchanged
         # $x has been incremented by 4
  3. or download this
    $x = $orig;
$x->add_ui_gmp(4); # Both $x and $orig have
                   # been incremented by 4