Adding John just to make sure he has seen this message:

On Sat, Feb 19, 2022 at 4:56 PM Arvydas Silanskas <xxxxxx@gmail.com> wrote:

Good evening,

Under `make-improper-ilist-comparator` it mentions `make-ipair-comparator`, however the procedure isn't specified (although it's easy to guess what it is). 

I checked the reference implementation, but it doesn't contain anything related to comparators. Should I go ahead and add them?

Arvydas