Stefan Monnier wrote:
>> and once you have the fake pointer, --enable-check-lisp-object-type
>> doesn't buy much extra safety that is useful.
> It does give us some extra checking, but not very much, indeed.
> Maybe we can turn it into a no-op.

To get the ball rolling on that, I installed the attached into master. This 
doesn't turn --enable-check-lisp-object-type into a no-op; it merely goes back 
to disabling it by default. We can remove it later if in practice it's not that 
helpful to enable it.