RE: sequence manipulation functions

[Drew Adams]

> > Emacs should follow Common Lisp in this regard.
> 
> why is compatibility with Common Lisp a requirement?

No one said it is a requirement.

> The main Common Lisp functions are already available
> in a dedicated package.

Precisely.  So either we don't need this added to the
"core" or we should move those functions to the core.

It makes little sense to just add stuff that kinda-sorta
does the same thing.