[tahoe-lafs-trac-stream] [tahoe-lafs] #1670: add tests for KeyError in mutable read-modify-write

[tahoe-lafs]

#1670: add tests for KeyError in mutable read-modify-write
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     Reporter:  vikarti  |      Owner:  zooko
         Type:  defect   |     Status:  assigned
     Priority:  normal   |  Milestone:  1.11.0
    Component:  code-    |    Version:  1.9.1
  mutable                |   Keywords:  mutable retrieve error tahoe-backup
   Resolution:           |  regression test-needed
Launchpad Bug:           |
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Comment (by zooko):

 Attaching an incident report file from joepie91 that I manually filtered
 to remove potentially sensitive information.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1670#comment:34>
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