* For the ``$ENVIRON`` and ``$RESPONSE`` :ref:`substitutions <state-substitution>` it is now possible to :ref:`cast <casting>` the value to a type of ``int``, ``float``, ``str``, or ``bool``.
* The ``JSONHandler`` is now more strict about how it detects that a body content is JSON, avoiding some errors where the content-type header suggests JSON but the content cannot be decoded as such.
* Better error message when content cannot be decoded.
* Addition of the ``disable_response_handler`` test setting for those cases when the test author has no control over the content-type header and it is wrong.