Function follow 

pub fn follow<Binding>(binding: Binding) -> FollowStream<Binding>
where
    Binding: 'static + Bound,
    Binding::Value: 'static + Send,

Creates a stream from a binding

This is the reverse operation from bind_stream(), which will turn a stream into a binding.

Binding streams will only return the most recent state of the binding when it’s requested: ie, they will skip states if a newer state is available. For this reason, don’t try to treat FollowStreams as if they work like mpsc channels. If you need a binding where all of the states are available, one approach would be to use a Publisher from the flo_stream crate alongside bind_stream().