> In short: blob id which going version is referring to can cleaned only if
> it is not
> referred by both previous or next versions. All other versions are irrelevant
> because they
> cannot refer the same blob id. At least in current codebase which creates a
> new copy of
> blob content on update.
Here you wrong: if blob contents was not changed by update, there will be
no new blob.
Regards,
Vlad
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