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Unintended behavior
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Description
Component used: Room Version used: 2.2.5 Devices/Android versions reproduced on: N/A
Please clarify the intended usage pattern of InvalidationTracker.addObserver(). It is annotated with @WorkerThread, but the javadoc does not mention any restriction or recommendation about the calling thread. Testing produces no errors either way, code inspection reveals a couple of synchronization blocks as the likely greatest performance detractors.