func makeValueProxy(L *lua.State, val reflect.Value, proxyMT string) {
rawptr := L.NewUserdata(uintptr(unsafe.Sizeof(ValueProxy{})))
ptr := (*ValueProxy)(rawptr)
ptr.value = val
ptr.t = val.Type()
lua.LGetMetaTable(L, proxyMT)
L.SetMetaTable(-2)
}