typeof() not functioning correctly for lightuserdata with a metatable

[forenoonwatch]

When creating a lightuserdata with a metatable and defining the __type tag, calling typeof() on the resultant object prints userdata, while it functions normally with a normal userdata object.

Code to reproduce:

lua_pushlightuserdata(L, anyValue);

if (luaL_newmetatable(L, "MyType")) {
  lua_pushstring(L, "MyType");
  lua_setfield(L, -2, "__type");
}

lua_setmetatable(L, -2);

lua_setglobal(L, "obj");

table.foreach(getmetatable(obj), print) -- metatable is not nil and correctly prints __type  MyType
print(typeof(obj)) -- prints userdata