From 79fa8dbad16a29e9db1e31ea01e921c585e73a90 Mon Sep 17 00:00:00 2001
From: murgatroid99 <mlumish@google.com>
Date: Thu, 20 Aug 2015 15:52:57 -0700
Subject: [PATCH] Replaced toLowerCase with local-insensitive downcasing
 function

---
 src/metadata.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/metadata.js b/src/metadata.js
index d4a8b266..77ababb6 100644
--- a/src/metadata.js
+++ b/src/metadata.js
@@ -48,12 +48,19 @@ function Metadata() {
   this._internal_repr = {};
 }
 
+function downcaseString(str) {
+  var capitals = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+  var lowercase = 'abcdefghijklmnopqrstuvwxyz';
+  var charMap = _.zipObject(capitals, lowercase);
+  return str.replace(/[A-Z]/g, _.curry(_.get)(charMap));
+}
+
 function normalizeKey(key) {
   if (!(/^[A-Za-z\d-]+$/.test(key))) {
     throw new Error('Metadata keys must be nonempty strings containing only ' +
         'alphanumeric characters and hyphens');
   }
-  return key.toLowerCase();
+  return downcaseString(key);
 }
 
 function validate(key, value) {