1.4.1 regression: TypeError: Decimal is not JSON serializable

[prokaktus]

Hello!

This issue introduced by commit 3b235cb.

django-hstore version: 1.4.1
django version: 1.7
python version: 2.7.6

Problem description:
My model have field hstore.DictionaryField. Before 1.4.1, in method ensure_acceptable_value, code

django-hstore/django_hstore/dict.py

Line 123 in 3b235cb

return force_text(json.dumps(value))

            ...
            elif isinstance(value, (list, dict)):
                return force_text(json.dumps(value))
           ...

works well with Decimal objects in lists, because simplejson supports dumps for Decimals. But standard python json not. Because of that I get TypeError: Decimal('10') is not JSON serializable

[nemesifier]

Please send a failing test with a patch.

[prokaktus]

Now it can be closed.

[nemesifier]

Thank you @prokaktus