A specified content type is now ignored if it is not a valid MIME type.
0.2.0
Dropped Python 3.6 support, added official Python 3.10, 3.11 and PyPy support.
A specified content type is no longer ignored for being a variant of `plain/text`, unless it is one of the 4 specific variants affected by the old Apache bug [13986](https://bz.apache.org/bugzilla/show_bug.cgi?id=13986).