[tahoe-lafs-trac-stream] [tahoe-lafs] #1643: presence of MDMF in aliases break the CLI < v1.9.0

[tahoe-lafs]

#1643: presence of MDMF in aliases break the CLI < v1.9.0
-------------------------+-------------------------------------------------
     Reporter:  zooko    |      Owner:
         Type:  defect   |     Status:  new
     Priority:  major    |  Milestone:  undecided
    Component:  code-    |    Version:  1.9.0
  mutable                |   Keywords:  versioning forward-compatibility
   Resolution:           |  backward-compatibility mutable mdmf aliases
Launchpad Bug:           |
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Comment (by davidsarah):

 For future reference, this should not have been an {{{assert}}}. Asserts
 should be used only for consistency checks that would indicate a bug if
 they ever fail, not for validating input. That is, if an assert can
 actually happen as a result of bad input, then it was the wrong way of
 expressing that constraint (because the resulting error reporting is
 usually ugly and provides insufficient information, and because asserts
 are [http://docs.python.org/reference/simple_stmts.html#the-assert-
 statement sometimes switched off]).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1643#comment:4>
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