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-rw-r--r--activesupport/lib/active_support/duration/iso8601_parser.rb1
-rw-r--r--activesupport/lib/active_support/duration/iso8601_serializer.rb1
2 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/duration/iso8601_parser.rb b/activesupport/lib/active_support/duration/iso8601_parser.rb
index e96cb8e883..f07a7817f9 100644
--- a/activesupport/lib/active_support/duration/iso8601_parser.rb
+++ b/activesupport/lib/active_support/duration/iso8601_parser.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "strscan"
require "active_support/core_ext/regexp"
diff --git a/activesupport/lib/active_support/duration/iso8601_serializer.rb b/activesupport/lib/active_support/duration/iso8601_serializer.rb
index 1cc731df2b..71504fc6cc 100644
--- a/activesupport/lib/active_support/duration/iso8601_serializer.rb
+++ b/activesupport/lib/active_support/duration/iso8601_serializer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/object/blank"
require "active_support/core_ext/hash/transform_values"