And before any major change, add a `--v2` for early adopters and `--v1` as default. Nobody should notice anything on `--v1`, any regression must be fixed imedia

And before any major change, add a `--v2` for early adopters and `--v1` as default. Nobody should notice anything on `--v1`, any regression must be fixed imediately. Flip `--v2` as default, leaving `--v1` for the unforseen. Until you can finally get rid of them. This helps being as invisible as possible.