RE: sequence manipulation functions

[Drew Adams]

> I see "cl-lib" as a compatibility package with Common Lisp, not a
> base library of the language. My goal is not to remove or replace
> "cl-lib", but to add core sequence functions to Elisp.

What does that even mean?  Is dired.el core?  Is subr.el?  simple.el?

If what you mean is something that is loaded automatically, from
the outset, then the question is simple: If such functions should
be available from the outset then load them from the outset (i.e.,
add them to the "core").

What I think we do not need is to proliferate additional functions
that do pretty much the same thing.  We don't need different levels
of a function that performs a "reduce" operation, one "in the core"
and another in a library not loaded by default.

Seems like a no-brainer, to me.  (Just one opinion.)