The thought behind this decision was that since `DGGKeyCombo` uses `NSUInteger` for its [`keyCode` property](https://github.com/dannygreg/DGGHotKey/blob/7ee064fc05a5705e1d5dfacb475a1ad9e7a42492/DGGKeyCombo.h#L31), the exposed type should match. The casting should be internal since the call to `UCKeyTranslate` is an implementation detail.