[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3476: Create unicode-only-keys and bytes-only-keys dictionaries

[Tahoe-LAFS]

#3476: Create unicode-only-keys and bytes-only-keys dictionaries
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 Reporter:  itamarst  |          Owner:  itamarst
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:  Support Python 3
Component:  unknown   |        Version:  n/a
 Keywords:            |  Launchpad Bug:
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 This will be helpful with Python 3p porting for places where it's hard to
 enforce with asserts, either due to extensive usage or things like `x in
 dict` or `dict.get(x, default)`.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3476>
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