I meant it's an exception because it does not throw a warning, even though you are treating a string as a number. (This is contrary to $foo = $foo + 1). The DWI

I meant it's an exception because it does not throw a warning, even though you are treating a string as a number. (This is contrary to $foo = $foo + 1). The DWIM string auto-increment doesn't even kick in unless the variable matches /^[a-z]/i.