Keep non-printable characters out of details documents
Future Tor will not publish non-ASCII descriptors and dir auths will reject them at some point.
Since this is quite far in the future, what do you think about removing such strings in onionoo (before it reaches tor)?
I'm not suggesting to ignore the entire descriptor in such a case but just replace such chars with "?" ?
?" -> "??B??"
Note: I used "non-printable" (vs. non-ASCII) since onionoo data includes printable but non-ASCII chars.