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-rw-r--r--activemodel/lib/active_model/attribute_methods.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/attribute_methods.rb b/activemodel/lib/active_model/attribute_methods.rb
index b3b39bf7ae..c87fd64a10 100644
--- a/activemodel/lib/active_model/attribute_methods.rb
+++ b/activemodel/lib/active_model/attribute_methods.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "concurrent/map"
require "mutex_m"