From 0b4d1250ca34fe41636acacdd02023df44c95cef Mon Sep 17 00:00:00 2001
From: facelessuser <faceless.shop@gmail.com>
Date: Wed, 17 Mar 2021 14:25:20 -0600
Subject: [PATCH] Address two divide by zero cases that were missed

---
 coloraide/__meta__.py                | 2 +-
 coloraide/colors/hsl.py              | 2 +-
 docs/src/markdown/about/changelog.md | 5 +++++
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/coloraide/__meta__.py b/coloraide/__meta__.py
index 4ea283877..aecf663b2 100644
--- a/coloraide/__meta__.py
+++ b/coloraide/__meta__.py
@@ -188,5 +188,5 @@ def parse_version(ver):
     return Version(major, minor, micro, release, pre, post, dev)
 
 
-__version_info__ = Version(0, 1, 0, "alpha", 9)
+__version_info__ = Version(0, 1, 0, "alpha", 10)
 __version__ = __version_info__._get_canonical()
diff --git a/coloraide/colors/hsl.py b/coloraide/colors/hsl.py
index 2e860372b..b64b0e2a1 100644
--- a/coloraide/colors/hsl.py
+++ b/coloraide/colors/hsl.py
@@ -28,7 +28,7 @@ def srgb_to_hsl(rgb):
             h = (b - r) / c + 2.0
         else:
             h = (r - g) / c + 4.0
-        s = c / (1.0 - abs(2.0 * l - 1))
+        s = 0 if l == 0 or l == 1 else c / (1.0 - abs(2.0 * l - 1))
         h *= 60.0
 
     return HSL._constrain_hue(h), s * 100.0, l * 100.0
diff --git a/docs/src/markdown/about/changelog.md b/docs/src/markdown/about/changelog.md
index b3b0a5817..4d3b24da5 100644
--- a/docs/src/markdown/about/changelog.md
+++ b/docs/src/markdown/about/changelog.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.10a10
+
+- **FIX**: Address two divide by zero cases in HSL algorithm. Was missing some special cases when luminance equals `1`
+  or `0`.
+
 ## 0.1.0a9
 
 - **FIX**: Ensure all cases of hue handling, in regards to gamut mapping, are done the same.