Calls the given callback function when current valve closed.
callback
If the valve is closed already, then calls the callback immediately.
Does nothing if there is no current valve.
Calls whenClosed method of current sink internally.
Function to call once this valve is closed.
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Calls the given
callbackfunction when current valve closed.If the valve is closed already, then calls the
callbackimmediately.Does nothing if there is no current valve.
Calls whenClosed method of current sink internally.