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print ~"3"; 
print pack("c",~ord("3"));
...

print ~3
print unpack("L", ~"\x00\x00\x00\x03");

$x = "3"; print ~$x; # This is...
$x = 3;   print ~$x; # Not the same as this... 
$x .= ""; print ~$x; # But, after stringification, it is.