From 969b99af100eb995316af234deb3840cb0dcd205 Mon Sep 17 00:00:00 2001
From: Mike Perham <mperham@gmail.com>
Date: Mon, 23 Jan 2012 09:33:46 -0800
Subject: [PATCH] .dup key before forcing encoding, GH-162

This matches what AS 3.2 does already.
---
 History.md                              | 3 ++-
 lib/active_support/cache/dalli_store.rb | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/History.md b/History.md
index ca2cc192..2377f5be 100644
--- a/History.md
+++ b/History.md
@@ -4,7 +4,8 @@ Dalli Changelog
 HEAD
 =======
 
-- Fix double namespacing with Rails and dalli\_store.
+- Fix encoding issue with keys [#162]
+- Fix double namespacing with Rails and dalli\_store. [#160]
 
 1.1.4
 =======
diff --git a/lib/active_support/cache/dalli_store.rb b/lib/active_support/cache/dalli_store.rb
index caab841d..c339b84d 100644
--- a/lib/active_support/cache/dalli_store.rb
+++ b/lib/active_support/cache/dalli_store.rb
@@ -149,8 +149,8 @@ def delete_entry(key, options) # :nodoc:
 
       private
         def escape_key(key)
-          key = key.to_s
-          key = key.force_encoding('ASCII-8BIT') if key.respond_to? :force_encoding
+          key = key.to_s.dup
+          key = key.force_encoding('BINARY') if key.respond_to? :force_encoding
           key = key.gsub(ESCAPE_KEY_CHARS){|match| "%#{match.getbyte(0).to_s(16).upcase}"}
           key = "#{key[0, 213]}:md5:#{Digest::MD5.hexdigest(key)}" if key.size > 250
           key