How to check generic type in Swift

Issue #74

When dealing with generic, you shouldn’t care about the types. But if you need, you can

 func isPrimitive<T>(type: T.Type) -> Bool {
  let primitives: [Any.Type] = [
    Bool.self, [Bool].self,
    String.self, [String].self,
    Int.self, [Int].self,
    Float.self, [Float].self,
    Double.self, [Double].self
  ]

  return primitives.contains(where: { $0.self == type.self })
}