Strange function overloading behavior with int and enum

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I have to admit when I first read this I thought you were smoking crack. Obviously the solution to your example is an Explicit cast, but I get your point. I have absolutly no idea why it behaves this way. I even modified the enum and assigned different values 10,20,30 so that there was no 0 "Bar" value and it still calls the Foo(Bar a) when 0 is used as a argument.

Long and short of it, pretty darn interesting, I bet that was a b-word to debug.