bug#70784: Abolish string resizing

[Mattias Engdegård]

5 maj 2024 kl. 23.14 skrev Stefan Monnier <monnier@iro.umontreal.ca>:

> Very nice.  For track-changes, the backtraces aren't as important,
> because we often detect the problem only after the fact so the backtrace
> may be unrelated (which is why I also record the recent keys).

Right, recent keys are probably less important for `aset`. I doubt the proposed 
warning would trigger very often but if it does, it should given ample 
information to the user.