- Removed the ability to influence and query a ``pyramid.request.Request``
  object as if it were a dictionary.  Previously it was possible to use methods
  like ``__getitem__``, ``get``, ``items``, and other dictlike methods to
  access values in the WSGI environment.  This behavior had been deprecated
  since Pyramid 1.1.  Use methods of ``request.environ`` (a real dictionary)
  instead.