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If the same `CentralAuthUser` object is loaded multiple times in the same process, each load triggers a WAN cache read. Fixing that should be trivial and low-risk - just make sure the in-process cache is memory-limited (e.g. `HashBagOStuff` with an entry count limit) and is invalidated any time the WAN cache is.

If the same `CentralAuthUser` object is loaded multiple times in the same process, each load triggers a WAN cache read. Fixing that should be trivial and low-risk - just make sure the in-process cache is memory-limited (e.g. `HashBagOStuff` with an entry count limit) and is invalidated any time the WAN cache is.

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