added UnsafeUnion type - #50
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`UnsafeUnion[A, B]` is a gradual type whose materializations are exactly `A` and `B`: a union in target position, an intersection in source position. it is what an ambiguous overload call now evaluates to instead of `Unknown`, so the menu of possible returns survives.
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UnsafeUnion[A, B]is a gradual type whose materializations are exactlyAandB: a union in target position, an intersection in source position. it is what an ambiguous overload call now evaluates to instead ofUnknown, so the menu of possible returns survives.