title: How to implement Unity like internal call with mono
body: <p>C# side code</p>
  
  <pre><code>[WrapperlessIcall]
  
  [MethodImpl(MethodImplOptions.InternalCall)]
  
  private extern void INTERNAL_set_rotation(ref Quaternion value);
  </code></pre>
  
  <p>How to expose this method from C++ to mono</p>
  
  <p>Thanks.</p>