Jython has historically lagged hard, often falling behind for very extended periods. For a time their releases basically just stopped, which led to them missing

Jython has historically lagged hard, often falling behind for very extended periods. For a time their releases basically just stopped, which led to them missing support for pretty much anything between 2.7 and 3.6 (iirc). I know the project basically rebooted at some point, but I've since lost interest.