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Is there a design doc one could study? At a high level I understand how the fact that patches are commutative is elegant, but it seems to me there are performance impacts when, to get to a repository state, we have to apply many patches. Would love to read how pijul thinks about that.

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This is indeed one of the issues of Pijul, but patch application is extremely fast, which makes it easy in the vast majority of cases (we don't apply patches to files directly, but to an on-purpose on-disk datastructure).

We also have a tag features, allowing you to pinpoint versions and go back instantly, and we have plans to make that feature even lighter on disk space.

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