[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3801: Clarify behavior of overwriting in immutable uploads

[Tahoe-LAFS]

#3801: Clarify behavior of overwriting in immutable uploads
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     Reporter:  itamarst  |      Owner:  itamarst
         Type:  task      |     Status:  new
     Priority:  normal    |  Milestone:  HTTP Storage Protocol
    Component:  unknown   |    Version:  n/a
   Resolution:            |   Keywords:
Launchpad Bug:            |
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Comment (by itamarst):

 In order to reduce scope of PRs, persistent `BucketWriter` will happen in
 #3793, and this will just do the "prevent overlapping writes that don't
 match", with state in the ... `BucketWriter`? Or `ShareFile`, ugh.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3801#comment:10>
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