new instance based validation

src/quorum/model.py

@@ -664,8 +664,9 @@ def links(cls):
         for name in methods:
             method = getattr(cls, name)
             if not hasattr(method, "_link"): continue
-            is_instance = isinstance(method, types.FunctionType)
-            method._link.instance = is_instance
+            reference = hasattr(method, "__self__") and method.__self__
+            is_instance = False if reference else True
+            method._link["instance"] = is_instance
             links.append(method._link)
 
         # sorts the various links taking into account the name of
@@ -729,6 +730,9 @@ def operations(cls):
         for name in methods:
             method = getattr(cls, name)
             if not hasattr(method, "_operation"): continue
+            reference = hasattr(method, "__self__") and method.__self__
+            is_instance = False if reference else True
+            method._operation["instance"] = is_instance
             operations.append(method._operation)
 
         # sorts the various operations taking into account the name of