Publishing the same immutable content when some shares are unrecoverable does not repair that content.

[nejucomo]

From srl295 on IRC:

Interesting behavior- Had some stuff on our grid backed up with 'tahoe backup' which creates Latest, Archive etc- some of them are immutable dirs. Then, I lost a drive. So that particular storage node went down and never came back. Some directories were irrecoverable, OK fine. I create new directories and run tahoe backup again on the new directory URI. However, I'm still getting errors on deep check. - ERROR: NotEnoughSharesError?(ran out of shares: complete= pending=Share(sh1-on-sslg5v) overdue= unused= need 2. Last failure: None) -- I wonder, is tahoe reusing some unrecoverable URIs since the same immutable directory was created?