Question: Unsubscribe?

Do `` elements automatically unsubscribe on componentWillUnmount?

I'm getting these errors while unmounting:
`Warning: setState(...): Can only update a mounted or mounting component. This usually means you called setState() on an unmounted component. This is a no-op. Please check the code for the Subscribe component.`

Start by inspecting the component and its componentWillUnmount behavior, then reproduce the reported warning during unmounting. Determine whether subscriptions are cleaned up as expected; done when the unmount behavior is clear and the warning no longer occurs or its cause is documented.

Written by the indexing model from the issue text.