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Explain why we're prefilling dict with Nones
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@ -412,6 +412,10 @@ class StateStore(SQLBaseStore):
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for group, state_ids in group_state_dict.items():
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if types:
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# We delibrately put key -> None mappings into the cache to
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# cache absence of the key, on the assumption that if we've
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# explicitly asked for some types then we will probably ask
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# for them again.
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state_dict = {
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key: None
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for key in types
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