bug#21701: Fwd: cl-typecase broken (was 25.0.50; ert explainer for equal can't handle negative numbers)

[Stefan Monnier]

> That's indeed what should be done if ERT needs this to be a plain
> character that can inserted in a string.  Common-Lisp's `character'
> includes not just characters but also "characters with modifiers" such
> as ?\M-\H-é, which can't appear in a string and are rejected by
> `characterp'.

I installed a patch which makes ERT use pcase over cl-typecase.
In most cases it doesn't make a big difference, but in a few spots, it
is cleaner because a subsequent cl-destructuring-bind can be merged into
it (and it got rid of those places where we used (member :foo)
as a type to just check equality, which is rather inefficient).


        Stefan