| 123456789 |   o Minor bugfixes (directory authority):    - When a directory authority rejects a descriptor or extrainfo with      a given digest, mark that digest as undownloadable, so that we      do not attempt to download it again over and over. We previously      tried to avoid downloading such descriptors by other means, but      we didn't notice if we accidentally downloaded one anyway. This      behavior became problematic in 0.2.7.2-alpha, when authorities      began pinning Ed25519 keys. Fixes ticket      22349; bugfix on 0.2.1.19-alpha.
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