code: func Unproxify(L *lua.State) int {
  	if !isValueProxy(L, 1) {
  		L.PushNil()
  		return 1
  	}
  	v, _ := valueOfProxy(L, 1)
  	GoToLua(L, v)
  	return 1
  }
docs: // Unproxify converts a proxy to an unproxified Lua value.
  //
  // Argument: proxy
  //
  // Returns: value (Lua value)