duplicate function declaration or code chunk; comment out old and modify new; leave old inline until you're happy with new and verified existing functionality isn't lost. Super useful working pattern I think that I use constantly. If it was more than `V p` Maybe i wouldn't work like that; but I do because it is so frictionless.

The more I use Git the more I've been committing/diffing for similar effect; but it's still much more overhead for smaller checks.