LISP ZIPPERS

Integrating zippers into the very core of Lisp as a replacement/enhancement of cons lists.

Discuss.

>>1
You can have zippers as pairs of lists right now, and defmacro whatever facilities you want to have with them.  No lisp would take them as the core concept because while they are often useful, in most cases plain old lists are just fine.

>>2
It is what you unzip to take a pee