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-rw-r--r--activesupport/lib/active_support/core_ext/enumerable.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb
index 3a4ae6cb8b..a744b78e1c 100644
--- a/activesupport/lib/active_support/core_ext/enumerable.rb
+++ b/activesupport/lib/active_support/core_ext/enumerable.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module Enumerable
# Enumerable#sum was added in Ruby 2.4, but it only works with Numeric elements
# when we omit an identity.