On Sat, Nov 30, 2019 at 2:09 PM Lyberta via Std-Proposals <std-proposals@lists.isocpp.org> wrote:
I wanted to point out that making std::span API compatible with
std::vector and std::array is still not ideal.

We won't get there anyway.  For instance, comparison operators such as operator== were deliberately removed (by P1085R2 in San Diego) because the committee believes because span is non-owning and therefore not regular, it shouldn't have comparison operators, even though there was no evidence presented that this is a problem for, say, string_view users.
 Nevin ":-)" Liber  <mailto:nevin@cplusplusguy.com>  +1-847-691-1404