LGTM regarding #208 .
My patch is already merged well.

@tiran, @encukou any thoughts on this and the dependent PRs?

This is out of my depth.
@tiran, do you want to review this?

Any ideas on a review? Without this it's impossible to have more than one operation pending on a connection.

My review will be sub-par, but it looks like I'll need to do it to move this forward. I'll dedicate a day next week to python-ldap.

Thanks, I'll rebase it in the meantime.

Only fails on the same doctest as master now.

The last commit should go into a separate PR:

• Adding a new item to the result4's return value tuple will break code that unpacks the tuple. This needs either adding a result5(), or fixing Use PyStructSequence for result() return value #61.
• The raise_for_result and RAISE_* and need documentation.

I've moved the WIP commit into its own branch, but kept the .errnum one in for now. Let me know if it should be moved too.