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-rw-r--r--actionpack/lib/action_controller/caching.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/caching.rb b/actionpack/lib/action_controller/caching.rb
index 954265ad97..86c1194ce0 100644
--- a/actionpack/lib/action_controller/caching.rb
+++ b/actionpack/lib/action_controller/caching.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActionController
# \Caching is a cheap way of speeding up slow applications by keeping the result of
# calculations, renderings, and database calls around for subsequent requests.