>   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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