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-rw-r--r--activemodel/lib/active_model/dirty.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb
index dc81f74779..4dfa312223 100644
--- a/activemodel/lib/active_model/dirty.rb
+++ b/activemodel/lib/active_model/dirty.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/hash_with_indifferent_access"
require "active_support/core_ext/object/duplicable"