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I don't think I actually ran into an issue here, but there's one lying in wait.
This was nearly harmless, as "completing" with `NULL` just writes `NULL` as the CID, which is what it already was. This change fixes two things: 1. We no longer log that we completed something when we didn't. 2. We avoid a theoretical race condition where the correct CID has been written to the DB and we overwrite it with our old `NULL`. I'm not sure we even have enough concurrency for this to be a problem, but the change still feels safer.
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This PR contains a few minor fixes and refactors, but mainly this fixes a bad
t_sizecalculation. We ended up setting thet_sizeof a link to the size of the node it points to, when in fact it should be the entire DAG it points to, cumulatively up to the root.We also had a bad calculation in the check, which this also addresses.
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