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-rw-r--r--actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb b/actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb
index 4cce86dcca..373b9d7fe3 100644
--- a/actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb
+++ b/actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActionCable
module SubscriptionAdapter
class SubscriberMap