<=> and obfuscation

[Arnold Robbins]

> [Aren't you hungry...]
> 
> 	To exchange two items without an intermediate variable, try:
> 
> 	b ^= a ^= b ^= a
> 
> Jon Shapiro

However, if a == b when you start out, you end up with a == 0 && b == 0.

This also only works on integer style variables.
-- 
Arnold Robbins
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