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I vaguely remember that somebody from github claimed in HN comment that all objects are shared.

Puting whole github in single packfile is obviously impractical, but having whole github on some bespoke Venti/IPFS-style content addressable object store is not.

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It's not impossible but it too is impractical for performance reasons. Providers that run git core repack repositories regularly because packfiles are efficient; loose objects are horribly inefficient - even on the local filesystem. Moving them to a network filesystem is impractical.

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