Do not compare types in coercion model richcmp() #24968
Description
Though small, the fix to richcmp is significant and fixes a lot of bugs.
Component: coercion
Keywords: structure coerce
Author: Erik Bray, Jeroen Demeyer
Branch/Commit: de73aad
Reviewer: Jeroen Demeyer, Frédéric Chapoton
Issue created by migration from https://trac.sagemath.org/ticket/24968