Re: What's missing in ELisp that makes people want to use cl-lib?

[Stefan Monnier]

> Anyway - as I already mentioned I have absolutely no intuition about the
> performance characteristics of cl-generic's dispatch mechanism.

I don't have a good understanding of it either.
I did investigate a performance issue in `cl-print.el` where it seemed
clear that a significant part of the overhead comes from memory
allocations (and associated GC load) coming from `&rest`.

For this reason, I've been toying (in my mind only, so far) with how we
could have something like `&rest` but which doesn't allocate memory
from the heap for the specific sub-case of

    (lambda (.. &rest args)
      ...
      (apply ... args)
      ...)


-- Stefan