Noticed this with 16.3 alpha: <img width="238" alt="screen shot 2018-02-18 at 21 58 15" src="https://user-images.githubusercontent.com/810438/36357507-e855da24-14f6-11e8-8398-b568fe92efd2.png"> I think we just need to support it here: https://github.com/facebook/react/blob/master/packages/shared/getComponentName.js. Or else we could skip them [here](https://github.com/facebook/react/blob/e68c0164aa92ed383a0060639d9c449e2f740fb5/packages/react-reconciler/src/ReactDebugFiberPerf.js#L162) altogether.