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55e4b5ee09
Bug fix for PM-15914 where switching users would incorrectly share cached derived states. The `DerivedStateProvider` now uses a `WeakMap` to maintain separate caches for each user's state `Observable`. - Modifies `DefaultDerivedStateProvider` to use `WeakMap` for caching - Each user's state `Observable` gets its own definition cache - Added test to verify correct behavior during user switching - Allows proper garbage collection of unused state caches This fixes issues where: - Users would see other users' cached states after switching accounts - Derived states weren't properly isolated between users - Cache keys didn't distinguish between different user states