`get_or` fails for temporaries

[TerensTare]

Hi, I want to use get_or to get a value out of a table or if missing use a default, but I'm having some trouble making it work for a specific use case. To my understanding, the following should work just fine:

struct pos { int x, y; };

auto p = lua_table.get_or("myPos", pos{0, 0});

However, it fails to compile in MSVC, GCC and Clang, whereas the following works just fine:

struct pos { int x, y; };

pos alt{0, 0};
auto p = lua_table.get_or("myPos", alt);

Is this the intended behavior or is it a bug? If this is intended, I think it's best if we get a static_assert saying that our "alternative" should be a lvalue (I guess?), it should be more helpful than the current state of things.

Here's a godbolt link with a complete example.