[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3399: Evaluate adding mypy checks to code checks

[Tahoe-LAFS]

#3399: Evaluate adding mypy checks to code checks
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     Reporter:  jaraco       |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  normal       |  Milestone:  Support Python 3
    Component:  unknown      |    Version:  n/a
   Resolution:               |   Keywords:
Launchpad Bug:               |
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Comment (by jaraco):

 9ab3c4023 works around the errors in the few places where the issue
 occurred. Interestingly, there are still some `Referenceable` subclasses
 that don't appear to be affected (e.g. control:59).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3399#comment:24>
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