sympy/sympy — pull request #7996 by skirpichev (2014-09-08 09:16:58+00:00)
Title: Deprecate set.is_real property, use set.is_subset(Reals) instead

fixes #6212

(on top of https://github.com/sympy/sympy/pull/7861, see also https://github.com/sympy/sympy/pull/7972)