We used zope.proxy to implement blob storages as storage proxies. It
seemed like a good idea at the time, but since then I've added a
mix-in class that I've used in a number of storage implementations.
Do we still need the proxy-based implementation class? If we do, then
I plan to at least switch to using a simple pure-python proxying
mechanism. If no one speaks up in favor of keeping the proxying
support, I'll probably just drop it.
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