[tor-bugs] #32580 [Core Tor/Tor]: Use clang's enum_extensibility attribute to check enum values

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#32580: Use clang's enum_extensibility attribute to check enum values
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     Reporter:  teor          |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  code-correctness
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 We could avoid constructing bad enum values using enum_extensibility:
 https://clang.llvm.org/docs/AttributeReference.html#enum-extensibility

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32580>
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