What I'm most annoyed at with the variable initialization change is that:

  - It's potentially a performance change in every single function, especially ones that have sizable fixed-size buffers
  - If you have regressions you have to spray [[indeterminate]] everywhere, because there is no coarser way of suppressing it.
  - While the language says unrecognized attributes are ignored, compilers frequently warn on unrecognized attributes. Clang, for instance, currently warns on [[indeterminate]].
  - There is no defined macro name for backwards compatibility.

Which means that libraries are going have to all declare their own macros for [[indeterminate]] and pepper their code with it.