As a follow-up on #32566 and #32610, we replace isinstance
tests with RealField_class
by the sage.rings.abc.RealField
.
git grep -E 'isinstance.*(Real|Complex)Field_class'
finds these uses.
Depends on #32665
Depends on #32758
Depends on #32635
CC: @tobiasdiez @tscrim @EnderWannabe @bhutz
Component: refactoring
Author: Matthias Koeppe
Branch/Commit: 29e784b
Reviewer: Travis Scrimshaw
Issue created by migration from https://trac.sagemath.org/ticket/32742