Message 389574 - Python tracker

Good point Victor, though I wonder how likely it is that a person using 3.10 would only use this particular new feature, and have an otherwise backwards-compatible codebase.

This isn't something that I asked about out of necessity, and there hasn't been any other discussion of this idea that anyone can remember.

On the other hand, I suppose it would be possible to have a feature flag that can be used to disable decimal underscores in 3.10 to prevent test failures. Just spitballing...