Index: library/serialize/serializer.tcl
===================================================================
diff -u -r3754364287df2dfdf79b81dfa69224eae19cf691 -rd9b42d77f43db84a9983cc3bbc4124cf0b52df29
--- library/serialize/serializer.tcl	(.../serializer.tcl)	(revision 3754364287df2dfdf79b81dfa69224eae19cf691)
+++ library/serialize/serializer.tcl	(.../serializer.tcl)	(revision d9b42d77f43db84a9983cc3bbc4124cf0b52df29)
@@ -654,7 +654,7 @@
     }
 
     :method method-serialize {o m modifier} {
-      if {![::nsf::objectproperty class $o]} {set modifier ""}
+      if {![::nsf::is class $o]} {set modifier ""}
       return [$o {*}$modifier info method definition $m]
     }