Avoid looping through subscribers when unsubscribing with a subscriber object.

activesupport/lib/active_support/notifications/fanout.rb

@@ -27,7 +27,13 @@ def subscribe(pattern = nil, block = Proc.new)
 
       def unsubscribe(subscriber_or_name)
         synchronize do
-          @subscribers.reject! { |s| s.matches?(subscriber_or_name) }
+          case subscriber_or_name
+          when String
+            @subscribers.reject! { |s| s.matches?(subscriber_or_name) }
+          else
+            @subscribers.delete(subscriber_or_name)
+          end
+
           @listeners_for.clear
         end
       end
@@ -97,12 +103,11 @@ def finish(name, id, payload)
           end
 
           def subscribed_to?(name)
-            @pattern === name.to_s
+            @pattern === name
           end
 
-          def matches?(subscriber_or_name)
-            self === subscriber_or_name ||
-              @pattern && @pattern === subscriber_or_name
+          def matches?(name)
+            @pattern && @pattern === name
           end
         end