<div id="comment:0"></div> CC: @embray @jdemeyer @kiwifb Component: **packages: optional** Author: **Frédéric Chapoton** Branch/Commit: **[`eeaebe6`](https://github.com/sagemath/sagetrac-mirror/commit/eeaebe6c6e30e752085919535a028a2b1e42785b)** Reviewer: **Erik Bray** _Issue created by migration from https://trac.sagemath.org/ticket/27511_