Possibility of a strange memcache.decr() failure?

[Nikolaj]

Hi all,

I had a logic failure in my application this morning (4:30am UTC) that I can only explain if memcache.decr() returned an undecremented value (this is on the Python SDK).

I am not 100% sure that this actually happened, but it's my current best diagnosis. So I wanted to ask the Google folks if this is even remotely possible or if None would definitely be returned instead?

Thanks,

Nikolaj