[tahoe-lafs-trac-stream] [tahoe-lafs] #1537: fix some Interface violations

[tahoe-lafs]

#1537: fix some Interface violations
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     Reporter:  warner  |      Owner:  somebody
         Type:  defect  |     Status:  new
     Priority:  minor   |  Milestone:  1.10.0
    Component:  code    |    Version:  1.9.0a1
   Resolution:          |   Keywords:
Launchpad Bug:          |
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Changes (by zooko):

 * keywords:  reviewed =>


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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1537#comment:5>
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