From 4190a760e2aab63393833acb64d06ac97cfac0ad Mon Sep 17 00:00:00 2001
From: Zach Daniel <zach@zachdaniel.dev>
Date: Sun, 4 Apr 2021 03:12:56 -0400
Subject: [PATCH] improvement: allow specifying that calculation can't be nil
 (#220)