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Summary: We ran an experiment to test different implementations of TurboModules HostObjects, as the current one has various inefficiencies, such as re-creating HostFunctions on every property access. The strategy we found to be most efficient and flexible longer-term is to represent the TurboModule with a plain JavaScript object and use a HostObject as its prototype. Whenever a property is accessed through the prototype, we cache the property value on the plain object, so it can be efficiently resolved by the VM for future accesses. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D38355134 fbshipit-source-id: 59253091412d0c6827ad7a4b1ac7dc0c7fe89cc2