From 558b49af6d15469ad04334ab2850ff19aec1c2ce Mon Sep 17 00:00:00 2001
From: Connor Skees <connor1skees@gmail.com>
Date: Wed, 8 Jul 2020 10:25:37 -0400
Subject: [PATCH] better document purpose of `Identifier`

---
 src/common.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/common.rs b/src/common.rs
index 578e0f3..4f9ce1e 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -105,6 +105,11 @@ impl ListSeparator {
     }
 }
 
+/// In Sass, underscores and hyphens are considered equal
+/// when inside identifiers.
+///
+/// This struct protects that invariant by normalizing all
+/// underscores into hypens.
 #[derive(Debug, Clone, Eq, PartialEq, Hash)]
 pub(crate) struct Identifier(String);