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7 characters should be enough for most repos, and iirc git can deal with collisions already (so git co 1536dd9 in your example would bring a prompt).

How many commits is the repo you're running this on btw?

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Sure. And randomly generated UUIDs should not conflict... unless they do, and blow up a huge app in production. Yes, I have experienced that once.

the odds of truly randomly generated UUID's conflicting are .... really really low (see https://en.wikipedia.org/wiki/Universally_unique_identifier#...). If you had a collision, then the odds are truly opposed to anyone else ever having that problem in the foreseeable future, so thanks for taking the hit for the rest of us!

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