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-rw-r--r--activerecord/lib/active_record/core.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb
index 198c712abc..f1eaa07f1a 100644
--- a/activerecord/lib/active_record/core.rb
+++ b/activerecord/lib/active_record/core.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "thread"
require "active_support/core_ext/hash/indifferent_access"
require "active_support/core_ext/object/duplicable"