Postgres ArrayField should convert values when given a list

[Zerq]

Currently ArrayField.to_python only calls base_field.to_python when given string. In my opinion it should call it always. Currently using this field is inconsistent. Simple example:

    f = MyModel._meta.get_field("int_array")
    f.clean('[1, "2", 3]', None) # ok
    f.clean([1, "2", 3], None) # error

Proposed ArrayField.to_python, witch always calls base_field.to_python(val):

    def to_python(self, value):
        if isinstance(value, str):
            value = json.loads(value)
        return [self.base_field.to_python(val) for val in value]