Message 311592 - Python tracker

I encountered this bug while testing the code in this StackOverflow answer:

    https://stackoverflow.com/a/48565011/1600898

The code at the end of the answer runs on Python 3.5, but fails on 3.6 with the "unexpected keyword argument 'manager_owned'" error.

If someone knows of a workaround until the PR is accepted, it would be appreciated as well.