[rubygems/rubygems] Don't upcase Windows ENV when backing it up

I apparently did that to fix some issue with case insensitivity but I
didn't add a spec, and I think not upcasing should not cause issues.

https://github.com/rubygems/rubygems/commit/1b6f23275a

1 files changed, 1 insertions, 8 deletions

diff --git a/lib/bundler/environment_preserver.rb b/lib/bundler/environment_preserver.rb
index 47fd4d9584..444ab6fd37 100644
--- a/lib/bundler/environment_preserver.rb
+++ b/lib/bundler/environment_preserver.rb
@@ -19,14 +19,7 @@ module Bundler
     BUNDLER_PREFIX = "BUNDLER_ORIG_"
 
     def self.from_env
-      new(env_to_hash(ENV), BUNDLER_KEYS)
-    end
-
-    def self.env_to_hash(env)
-      to_hash = env.to_hash
-      return to_hash unless Gem.win_platform?
-
-      to_hash.each_with_object({}) {|(k,v), a| a[k.upcase] = v }
+      new(ENV.to_hash, BUNDLER_KEYS)
     end
 
     # @param env [Hash]