Defer feeding XML data until we likely trigger an event #29
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Recent changes to expat, the XML parser behind the Python XMLPullParser, utilize a backoff when feeding the parser in small chunks which don't (yet) constitute something interesting. Unfortunately, this could result in the parser sitting on a completed payload waiting for more data before it attempts parsing.
The safest mitigation I can find is to just wait until we get a '>' before feeding the parser, which should hopefully mean that we'll never trigger the backoff.
See python/cpython#115133 for related comments.