<div id="comment:0"></div> ``` sage: _ = var('n', domain='integer') sage: n.is_integer() False ``` All sorts of logic within Pynac depends on this. See also https://github.com/pynac/pynac/issues/11 Depends on #18695 Component: **symbolics** Author: **Ralf Stephan** Branch: **[`fcb445d`](https://github.com/sagemath/sagetrac-mirror/commit/fcb445dd65d011ec60f1546a2601c6e558244a51)** Reviewer: **Vincent Delecroix** _Issue created by migration from https://trac.sagemath.org/ticket/18921_