Fix incr/decr

[elbaro]

What do these changes do?

Are there changes in behavior for the user?

Related issue number

#431

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[Dreamsorcerer]

I'm pretty sure you're correct, but I'm a little confused with why codecov says the line is fully covered already:
https://app.codecov.io/gh/aio-libs/aiomcache/blob/master/aiomcache%2Fclient.py#L333

[elbaro]

Not sure how codecov works but the line (L333) is covered and it's probably one statement even if some expressions are not visited.
Is there anything else required to merge this?

[Dreamsorcerer]

Not sure how codecov works but the line (L333) is covered and it's probably one statement even if some expressions are not visited.

It has branch coverage, so if the condition was always True, then it'd be highlighted yellow to show the line only has partial coverage. That's the bit that confuses me. It's probably fine though, might just be a hiccup with the coverage tool.

[elbaro]

For anyone who needs this patch, use a fork pip install aiomcache-pr432.