P2988R12: `std::optional<T&>`

[frederick-vs-ja]

Link: https://wg21.link/P2988R12

Feature-test macro (increased):

#define __cpp_lib_freestanding_optional 202506L
#define __cpp_lib_optional              202506L

Note that __cpp_lib_freestanding_optional also relies on P2407R5 (#105391).

[frederick-vs-ja]

I've heard that @Zingam planned to work on this.

[smallp-o-p]

@Zingam (sorry for double ping, originally put this comment in the wrong issue...) mentioned the possibility of letting me work on this issue in this comment and I'd like to do so once #149441 is done with--or work on it in parallel.

[Zingam]

@smallp-o-p Great! I've assigned this issue to you. I'm looking forward for this very much. Thank you.
In case you can't work work on this. Please let me know. I'll pick it up again.