[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3923: Refactor allmydata.immutable.encode.Encoder to separate out the uri_extension code

[Tahoe-LAFS]

#3923: Refactor allmydata.immutable.encode.Encoder to separate out the
uri_extension code
-------------------------+---------------------------
 Reporter:  itamarst     |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  undecided
Component:  unknown      |        Version:  n/a
 Keywords:               |  Launchpad Bug:
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 Creating a URI extension, calculating its size, etc. are all fairly
 independent actions that code be in a separate class from `Encoder`. This
 would make testing easier, and also make it much easier to document and
 enforce invariants, vs. the current "dictionary-o-things smushed into
 another class" approach.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3923>
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