Cast asserts a type given by a type parameter for a value This is not directly suppoerted by Go.

CastPointer maps a pointer P to an interface type I avoiding typed nil pointers.

CastPointerR maps a pointer P to an interface type I for a factory function with an additional error result avoiding typed nil pointers.

CastR cast a result type to a dedicated Type T for a factory function with an additional error result Nil will be mapped to the initial value of the target type.

TryCast is like Cast, but reports whether the assertion is possible or not.

TryCastE casts one type parameter to another type parameter, which have a subtype relation.