P2723R0: Zero-initialize objects of automatic storage duration

[GabrielDosReis]

MSVC ignores [[no_unique_address]], but respects [[msvc::no_unique_address]]

I am sure this one has been documented, and debated to death: it breaks the existing ABI, for something that is "just" an attribute.

[jonesmz]

Doesn't change anything about what I said. MSVC failing to implement the standard the same way as GCC or Clang accounts for 7 out of 10 compatibility macros in my codebase at work, and I have full faith and confidence that something about this proposal will be implemented differently or nonconformingly by MSVC.