Contextual / DecoratorTools.classy oddity

Sorry to bother you but it's me again. Here's an odd error (also attached):

>>> from peak.context import Service
>>> from peak.util.decorators import classy
>>>
>>> class A(Service, classy): pass
...
>>> class B(A): pass
...
>>> class C(A): pass
...
>>> class D(B,C): pass
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "c:\python25\lib\site-packages\DecoratorTools-1.7-py2.5.egg\peak\util\decorators.py",
line 625, in __new__
    cls = super(classy_class, meta).__new__(meta, name, bases, cdict)
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a
(non-strict) subclass of the metaclasses of all its bases



This seems to be exactly the thing classy is supposed to help avoid
and it's very strange to me that error happens when declaring D cause
there shouldn't be any MRO changes -- the subclasses are empty. The
actual case when I got this was trying to subclass both Service and
Component.


-- 
Best Regards,
Sergey Schetinin

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from peak.context import Service
from peak.util.decorators import classy

class A(Service, classy): pass
class B(A): pass
class C(A): pass
class D(B,C): pass