Where does nativeGetUninitializedObject actually exist?

Question

I was curious about some serialization stuff so I went poking around FormatterServices and found a method called nativeGetUninitializedObject that

Answer 1

This method actually exists in the native portion of the CLR. The MethodImplOptions.InternalCall signifies a call which is forwarded to the CLR native code and is implemented there.

From MSDN:

Specifies an internal call. An internal call is a call to a method that is implemented within the common language runtime itself.