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A rewrite of error handling, with semantics that more closely match stack unwinding. Errors that are thrown during the render phase unwind to the nearest error boundary, like before. But rather than synchronously unmount the children before retrying, we restart the failed subtree within the same render phase. The failed children are still unmounted (as if all their keys changed) but without an extra commit. Commit phase errors are different. They work by scheduling an error on the update queue of the error boundary. When we enter the render phase, the error is popped off the queue. The rest of the algorithm is the same. This approach is designed to work for throwing non-errors, too, though that feature is not implemented yet.