conncache api documentation and not throwing errors

I think there are two parts to this:

API documentation:

The conncache bullet point does not make it clear that it expects a filename. When it asks for a path it makes me think directory.

Library
Connacahe does not throw an error when it cannot create the file. As a result of the documentation I gave conncache a folder which I already made:

cb = Couchbase.connect(host=servers, bucket='Jimmy',conncache='/couchbase/')

There was no error or warning.