RE: moving more cl seq/mapping support into core

[Drew Adams]

> > But I don't know what you meant by TEST.
> > AFAIK, the CL signature is this:
> >
> > remove-if PREDICATE SEQ &key :from-end :start :end :count :key
> 
> I think Miles was talking about making a new remove-if that accepts an
> optional argument, one that is not second class.

Sorry, I don't get it.  What is TEST for?  It is typically for a binary
predicate such as `equal' - but we already have PREDICATE here.  And just what
is second class here (if TEST is not added)?