2542.Newandimproved

A new :meth:~falcon.Request.get_param_as_dict method was added to :class:~falcon.Request that retrieves a query parameter as a dict. Two input formats are supported: an alternating key/value list (e.g. param=k1,v1,k2,v2) and, when deep_object is set, the OpenAPI v3 deepObject style (e.g. param[k1]=v1&param[k2]=v2).