I'd like to discuss the project policy/process for dealing with incorrect backward incompatibilities that end up released.
In Twisted 16.3.0 the behavior of Request.write was changed so that it raises an AttributeError if called after the connection has closed. Prior to that release, it silently did nothing in that case.
Now, three years later, we have a PR which proposed restoring the behavior of silently ignoring the write to a closed connection.
The original change was incompatible. The new change is incompatible. What should win out?