diff -r 6fa712e9dfa5 -r 0af44a38fe41 utils.py
--- a/utils.py	Mon Jan 24 19:09:42 2011 +0100
+++ b/utils.py	Tue Feb 01 11:52:10 2011 +0100
@@ -67,6 +67,8 @@
 
 def support_args(callable, *argnames):
     """return true if the callable support given argument names"""
+    if isinstance(callable, type):
+        callable = callable.__init__
     argspec = getargspec(callable)
     if argspec[2]:
         return True