what is the best way in zope3 to create a collection of interfaces
without using classes, lists, etc.?
I have a number of interfaces that I'd like to group into a same
e.g. ISomeCollection = I1, I2, I3, I4 ....
and I'd like to be able to query which interfaces ISomeCollection
"contains". However I'd like not to instanciate a registry just to hold
that type of information.
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