Summary:
This bug was causing a redbox when touching rapidly because multiple touches had the same identifier. This code was meant to ensure that a unique ID is found, but it was checking against the wrong property in the react touch array.
I don't think this was really affecting prod, because the invariant is guarded by a __DEV__ check
@public
Test Plan:
- Start several touches at once (or just rapidly jam fingers on your device), and you won't see a redbox
- Also verify that single touches, touch moves, and multi touches work as before
f744c7c444