[libcxx-commits] [libcxx] [libc++] Provide `optional::iterator` a packed, bounded representation (PR #203782)

[William Tran-Viet via libcxx-commits]

smallp-o-p wrote:

> FWIW, I feel like we could land most of the changes here without making the iterators non-experimental? I didn't expect nearly as many changes for that.

Since there are more changes to come, this may be the safer option.

https://github.com/llvm/llvm-project/pull/203782