Subversion FSFS logical addressing and packed shard

  Hello,

I would like to better understand how logical addressing has impact on
packed shard. My objective is to provide a "unpack" feature with logical
addressing in my version of "fsfs-reshard.py" script:
https://github.com/ymartin59/svn-fsfs-reshard

Do you have any hints to help me in that job or do you already know it
is irrelevant and should be considered as a pure waste of time ?

Thank you in advance for your help

-- 
Yves Martin