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-rw-r--r--activerecord/lib/active_record/enum.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/enum.rb b/activerecord/lib/active_record/enum.rb
index 12ef58a941..f373b98035 100644
--- a/activerecord/lib/active_record/enum.rb
+++ b/activerecord/lib/active_record/enum.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "active_support/core_ext/object/deep_dup"
module ActiveRecord