v1.3.1

Fixed

• {% regroup %} over a single model refuses, as Django does (#3948). A model is not
  iterable, so {% regroup r by name as g %} over one raises TypeError; through a
  LiveView's state the tag was handed the model's serialized map and grouped its key
  names. The tag now refuses a source that is a serialized model map (a text __str__,
  a text __model__ and a pk), after any filters on the source have run. A regroup
  over a list, tuple or QuerySet of models, and over an ordinary dict, is unchanged.
  Pinned against Django on a real instance in
  python/tests/test_regroup_model_source_3948.py.

What's Changed

• fix: {% regroup %} over a single model refuses, as Django does (#3948) by @johnrtipton in #3953

Full Changelog: v1.3.0...v1.3.1