symbolize serializer keys for spec comparison

spec/support/matchers/broadcast_to_user_matcher.rb

@@ -27,7 +27,7 @@ module Matchers
       relevant_broadcasts = test_broadcaster.broadcasts.select{|b| b[:channel] =~ /^\/user\/#{@user_id}/ && b[:data][:event] == @message}
       @failure_message = "User #{@user_id} did not receive any broadcasts" and return false if relevant_broadcasts.empty?
       @failure_debug_content = "was #{relevant_broadcasts.map{|b| b[:data][:data].inspect}.join(" and ")}"
-      relevant_broadcasts.any? { |b| @target_object === b[:data][:data] }
+      relevant_broadcasts.any? { |b| @target_object === b[:data][:data].deep_symbolize_keys }
     end
 
     def message(msg)