Use to_gid_param for connection identifiers

lib/action_cable/connection/identification.rb

@@ -34,8 +34,8 @@ def connection_identifier
       private
         def connection_gid(ids)
           ids.map do |o|
-            if o.respond_to? :to_global_id
-              o.to_global_id.to_s
+            if o.respond_to? :to_gid_param
+              o.to_gid_param
             else
               o.to_s
             end

test/stubs/user.rb

@@ -8,4 +8,8 @@ def initialize(name)
   def to_global_id
     GlobalID.new("User##{name}")
   end
+
+  def to_gid_param
+    to_global_id.to_param
+  end
 end