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I agree, we work on Reviewable, which uses those same blobs.

However, we add tags to commits we're referencing, just in case someone at GitHub gets around to implementing garbage collection!

They must have refs on the internal git servers -- they need them for the "force pushed from X to Y" timeline events

You're right, though I think that changed recently? I vaguely remember only the last force push showed up, but now I see more than one so :shrug:

I've definitely clicked those links through to 404s.