I was trying to find a way to get ModelChoiceFields to use an already
cached Model, and I came across in django/forms/models.py , under
class ModelChoiceField, a variable called:

self.choice_cache=None

class ModelChoiceIterator seems to be the only thing that plays with
it, but with or without choice_cache having any value, it just returns
the same thing really.

I'm rather curious, what does it do? It looks like what I'm looking
for but not. It looks pretty pointless to me.
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