Present to C++ standards committee at Kona 2023 standards meeting

[jbcoe]

Scheduled to be presented in Kona In November https://github.com/orgs/cplusplus/projects/19/views/1?pane=issue&itemId=41839877

We need slides for a presentation preparing. We can base them on https://github.com/jbcoe/polymorphic_value/blob/main/talks/2022_07_05_CppOnSea.md

[jbcoe]

We initially (2023-11-08) presented wg21.link/P3019r1 and later we presented wg21.link/P3019r2 (2023-11-10).

The Library Evolution working group approved the design in wg21.link/P3019r2 but did not forward to the Library Group because they wanted some amendments to the paper (Remove optional specialization, correct noexcept status on swap (follow vector)). These edits have since been applied and submitted as merged PRs.

During discussion in LEWG and at the meeting in general we were able to improve our handling of allocators in assignment and swap to model vector (a container).

We added sections to the paper to cover modelled types (namely vector, optional and unique_ptr). This gave motivation for noexcept statuses, comparison support and more.