This also improves the performance for multi / batch commands a lot.
The reason is that now there are only callbacks internally even if
a promise is going to be returned in the end.
Standard is not as up to date and still uses a old eslint version.
Instead, use the airbnb default with a couple of modifications.
All required changes are included.
There is likely a better and more performant way to fix this but this works so far
and should be good enough to release and improve later.
Make test more robust
Add another test
