"providedBy/Acquisition" bug: acquisition wrappers do not provide "IAcquisitionWrapper"

[Dieter Maurer]

One would expect that (without special measures) an instance "i" of
a type "t" provides interface "I", if "t" implements it.

This is not the case for acquisition wrappers:

((Pdb)) p type(n_object)
<type 'ImplicitAcquirerWrapper'>
((Pdb)) p IAcquisitionWrapper.providedBy(n_object)
False
((Pdb)) p IAcquisitionWrapper.implementedBy(type(n_object))
True

Im am not sure whether this is a bug in "providedBy" or in
"Acquisition". Therefore, I report it here (being sure, that Jim reads these
bug reports).

[Dan Korostelev (nadako)]

Acquisition is part of zope2, so redirecting report there.

[Tres Seaver (tseaver)]

Fixing this would interfere with the goal that acquisition wrappers are as transparent as possible: they only add a handful of attributes (in the 'aq_' namespace) to the underlying 'self' instance.

I guess we could add an implementation for '__provides__' which tacked 'IAcquisitionWrapper' onto any interfaces provided by the 'self' (but I'm not signing up for it).

[Colin Watson (cjwatson)]

The acquisition project on Launchpad has been archived at the request of the Zope developers (see https://answers.launchpad.net/launchpad/+question/683589 and https://answers.launchpad.net/launchpad/+question/685285). If this bug is still relevant, please refile it at https://github.com/zopefoundation/acquisition.