The first path segment is unexpectedly interpreted as an authority after normalization

• scheme:/..///bar has scheme="scheme", authority=None, path=/..///bar.
  However, after normalization, it has scheme="scheme", authority="bar".
• Consider t1 as an IRI ..///bar resolved against scheme:.
  t1 should have scheme="scheme" and authority=None (since ..///bar does not contain authority).
  However, resulting string is scheme://bar, it has authority=bar.

And some more examples:

$ python
Python 3.9.9 (main, Jan 10 2022, 18:52:39)
[GCC 11.2.1 20211127] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from rfc3986 import uri_reference
>>> b = uri_reference('scheme:')
>>> r1 = uri_reference('..///bar')
>>> t1 = r1.resolve_with(b)
>>> t1
URIReference(scheme='scheme', authority=None, path='//bar', query=None, fragment=None)
>>> t1.unsplit()
'scheme://bar'
>>> r2 = uri_reference('/..///bar')
>>> r2.resolve_with(b)
URIReference(scheme='scheme', authority=None, path='//bar', query=None, fragment=None)
>>> uri_reference('scheme:/..///bar').normalize()
URIReference(scheme='scheme', authority=None, path='//bar', query=None, fragment=None)
>>> uri_reference('scheme:/..///bar').normalize().unsplit()
'scheme://bar'

I'm not sure how this should handled.
Collapsing the // at the beginning is not explicitly allowed by RFC 3986, so I think the normalization and the resolution cannot produce valid output and should fail in this case.
(But RFC 3986 does not seem to state that they can fail!)

This can caused by normalization during resolution, so #84 may also be affected by this issue.

Commencez par le point d’entrée uri_reference() et suivez normalize(), resolve_with() et unsplit() en vous appuyant sur les exemples de l’issue et les règles de la RFC 3986 qu’ils citent. Déterminez comment les doubles barres obliques initiales doivent être traitées lorsqu’aucune authority n’est présente, notamment en tenant compte de l’interaction relevée avec l’issue #84. Le travail est considéré comme terminé lorsque le comportement attendu est spécifié et que les exemples ne réinterprètent plus le premier segment du chemin comme une authority.