ref: 522588f699b3c910c5a47f8b8185e69250665313
parent: d422dd6009f3e48e13d5f7f162813537902e125c
author: Ben Harris <bjh21@bjh21.me.uk>
date: Tue Jan 10 18:37:21 EST 2023
Last-ditch grid-size limit for Fifteen At least prevent integer overflow when constructing the grid.