For a model, I have a ListProperty of Keys, and whenever I access it, it's a list of keys. Great. How can I access a ReferenceProperty of a model and have it return a Key instead of the actual instance (which has to be retrieved from datastore)? I've setup my models by putting a lot of info into key_names to minimize data transfer, and this would be a lot more useful if I could actually just use keys instead of instances.
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