Allow passing nil to functions as nil interface{} #87
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golang gotcha: reflect calls with nil params fail without this trick
…ce{} type parameters fixed
e.g.
a != nil
was not working when "!=" is overloaded with
func notEqual(a, b interface{}) interface{} {...}
Forgot to close ")"
…perators and passing nil
a == b replaced with a == nil to illustrated the problem when using nil directly in expression
We use the trick only for untyped nil: https://play.golang.org/p/MyAztoZaqhx
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