Hi Ari,
I won't really try to answer your question, but I'll give you the code for
gzipWithQ written by Alexey Rodriguez Yakushev some years ago for his
comparison on generic programming libraries. The original darcs repo no
longer exists, but here is the file which I think is relevant for you:
I want to implement generic comparison on top of syb-with-class, and
based on looking at syb, it seems I could base it on something like
gzipWithQ from syb's Data.Generics.Twins. However, there's no
Data.Generics.SYB.WithClass.Twins. So I set out to see if I can write
one myself (well, one with
