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Google uses piper, not git

Isn't Android on git?

AOSP is a distributed as a bunch of git repos, but Google uses an in-house VCS called piper.

Unless you're checking out old commits, `git clone --depth=1`. Then you get close to the ideal download size for any given repo.

If that is ideal why is it not the default?

Because it's unexpected behavior and not what you want most of the time. It's ideal in the sense of bytes on the wire.

Microsoft is a better example with git vfs and now Scalar.