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-rw-r--r--activemodel/lib/active_model/type/helpers/mutable.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/type/helpers/mutable.rb b/activemodel/lib/active_model/type/helpers/mutable.rb
index f3a17a1698..61569f1e7b 100644
--- a/activemodel/lib/active_model/type/helpers/mutable.rb
+++ b/activemodel/lib/active_model/type/helpers/mutable.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveModel
module Type
module Helpers # :nodoc: all