[tor-bugs] #23520 [Core Tor/Tor]: Assume iat-mode=0 if the input is unknown instead of failing

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#23520: Assume iat-mode=0 if the input is unknown instead of failing
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     Reporter:  cypherpunks   |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Low           |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 How to reproduce:

 1. Get an obfs4 bridge from BridgeDB http://z5tfsnikzulwicxs.onion/
 2. In `torrc` change `iat-mode=0` or `iat-mode=1` or `iat-mode=2` with
 `iat-mode=मस्तेआपकै`.
 3. Relaunch tor, it should fail.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23520>
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