!290 0xF2 DNS response code should be reverted
As discussed here tor!830 (comment 3094607) this error code:
- Exists only within the C Tor codebase to help in response processing
- Is not sent over the wire and is not intended to be sent over the wire, so is not part of the protocol
- Does not make much semantic sense, since an empty result set is representable without using this code
Therefore, ISTM that this spec change (!290 (merged)) was inappropriate and should be reverted. The code in C Tor (tor!830 (merged)) ought to be fixed to not to use a value from the protocol's namespace for its own internal purposes.
Ideally, C Tor with this use of this error code hasn't yet been released. If so the error code could be put back into the unregistered pool (perhaps with a note about this situation).
Also, the spec text in this area is confusing. I will prepare an MR against the spec.