bug#68244: hash-table improvements

[Gerd Möllmann]

Mattias Engdegård <mattias.engdegard@gmail.com> writes:

> * Compatibility with existing code is excellent except for some places
> that used `obarray-make` but then assumed the result to be vectors
> (using `vectorp` instead of `obarrayp` etc).

I wonder, what does your code do for the places using (make-vector n 0)
create obarrays? I'm not 100% sure, but I think Cedet was an example of
that in Emacs itself.