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## Summary We currently do deep diffing for object props, and also use custom differs, if they are defined, for props with custom attribute config. The idea is to simply do a `===` comparison instead of all that work. We will do less computation on the JS side, but send more data to native. The hypothesis is that this change should be neutral in terms of performance. If that's the case, we'll be able to get rid of custom differs, and be one step closer to deleting view configs. This PR adds the `enableShallowPropDiffing` feature flag to support this experiment. ## How did you test this change? With `enableShallowPropDiffing` hardcoded to `true`: ``` yarn test packages/react-native-renderer ``` This fails on the following test cases: - should use the diff attribute - should do deep diffs of Objects by default - should skip deeply-nested changed functions Which makes sense with this change. These test cases should be deleted if the experiment is shipped.