From 1d48d1d29af186a827c59bbc6968bb69c4370e8f Mon Sep 17 00:00:00 2001
From: Alice Cecile <alice.i.cecile@gmail.com>
Date: Fri, 10 Jun 2022 20:12:09 -0400
Subject: [PATCH] Make behavior of maybe_sub consistent

---
 src/math.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/math.rs b/src/math.rs
index eb38dadd7..e75a1d8d0 100644
--- a/src/math.rs
+++ b/src/math.rs
@@ -55,7 +55,7 @@ impl MaybeMath<Option<f32>, Option<f32>> for Option<f32> {
         match (self, rhs) {
             (Some(l), Some(r)) => Some(l - r),
             (Some(_l), None) => self,
-            (None, Some(_r)) => rhs,
+            (None, Some(_r)) => -rhs,
             (None, None) => None,
         }
     }
@@ -86,7 +86,7 @@ impl MaybeMath<f32, Option<f32>> for Option<f32> {
     fn maybe_sub(self, rhs: f32) -> Option<f32> {
         match self {
             Some(val) => Some(val - rhs),
-            None => None,
+            None => -rhs,
         }
     }
 }