An Observe type is a function that can be called to observe a sequence of values.
The Observe function is called with a Callback function that may be called zero or more times.
The Observe function returns an Unobserve function that can be called to stop observing the Observe function.
An Observe type is a function that can be called to observe a sequence of values. The Observe function is called with a Callback function that may be called zero or more times. The Observe function returns an Unobserve function that can be called to stop observing the Observe function.