I've changed the stage to "test needed". 

At a minimum, an interactive test should be written and added to the documentation.  Better would be an automated test (perhaps via subprocess).

The documentation should also be updated; at a minimum, there should be a versionchanged to say when the default changed. Ideally, also some clarification on the intended differences between DeprecationWarning and PendingDeprecationWarning, and whether there are any behavioral differences.