Hello,

I am considering writing a cache backend for Django based on a recent 
Couchbase SDK (2.0+).

While it is quite straightforward to write, I would like to know what is 
expected from a cache backend when errors happen.

With my experience using the python-memcached backend, my understanding is 
that:

 * On read operations, any errors result in a "None" return value (as if 
the value was not found);
 * On write operations, errors are silenced, with one exception;
 * On an "add" operation, if e.g. a network error has happened, "0" is 
returned instead of "False". That lets a client make a distinction between 
such errors and the key already existing.

Is that understanding accurate? In particular, is the third point 
contractual?

Thank you in advance.

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