[jbverschoor]

It makes more sense to use a second stream or named stream.

[PeterisP]

That sounds like a recipe for even more people accidentally storing and distributing that bytecode without wanting to do so, because it won't be immediately visible that it's there, many tools don't show or highlight the existence of those streams.

I'd argue that it's more appropriate to follow the 'explicit is better than implicit' from the 'guidelines' of https://www.python.org/dev/peps/pep-0020/ .