bug#45619: 28.0.50; pcase-let on MacOS doesn't work

[Drew Adams]

> > (pcase-let ((`(,default-directory) '( "/tmp/")))
> >     (call-interactively 'find-file))
> >
> > Expected behavior: Find file in "/tmp/"
> > Observed behavior: Find file in "~"
> 
> AFAICT the issue here is that `pcase-let' always creates lexically
> scoped bindings, even for special variables.  That can be surprising.
> 
> @Stefan, what can we do?  Document better?  Add compiler warnings?  Or
> is it possible to "fix" this?

Please do at least document it (along with the reason for it perhaps?).

What is the reason for it, BTW?