==================
- Revamp handling of query string and form decoding in ``BrowserRequest``.
The previous approach was to tell underlying libraries to decode inputs
using ISO-8859-1, then re-encode as ISO-8859-1 and decode using an
encoding deduced from the ``Accept-Charset`` request header. However,
this didn't make much conceptual sense (since ``Accept-Charset`` defines
the preferred *response* encoding), and it made it impossible to handle
cases where the encoding was specified as something other than ISO-8859-1
in the request (which might even be on a per-item basis, in the case of
``multipart/form-data`` input).
We now only perform the dubious ``Accept-Charset`` guessing for query
strings; in other cases we let ``multipart`` determine the encoding,
defaulting to UTF-8 as per the HTML specification. For cases where
applications need to specify some other default form encoding,
``BrowserRequest`` subclasses can now set ``default_form_charset``.
See `issue 65
<https://github.com/zopefoundation/zope.publisher/issues/65>`_.
- Add support for Python 3.10.