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SingleInstance

v10	v11
110	110	* it should be possible to force instantiation, because the serializers want that (solved by next item).
111	111	* the internals of the patch should be changed to be less magic: overriding __call__ is a neat trick but I'd rather have something like Model.get_singleton(pk, kwargs = None) and use this where needed (the places are few!). If the user wants to do Model(id = something, kwargs) he should get a fresh instance. If he wanted to have the DB one he'd have used get or something like that.
	112	* ^--- This is an opinion, and goes against the idea of this patch.
112	113	* For the sake of completeness, it should be possible to do Model.objects.get_fresh_instance(id=something) to bypass the singleton