Throw away any pending invocation of the debounced function.
If there is a pending invocation of the debounced function, invoke it immediately and return its return value.
Otherwise, return the value from the last invocation, or undefined if the debounced function was never invoked.
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Call the original function, but applying the debounce rules.
If the debounced function can be run immediately, this calls it and returns its return value.
Otherwise, it returns the return value of the last invocation, or undefined if the debounced function was not invoked yet.