off
Remove an event listener.
    compute.off(eventType, handler)
  
  const age = compute( 33 );
const handler = function( ev, newVal, oldVal ) {
    ev; //-> {type: "change", batchNum: 5}
    newVal; //-> 34
    oldVal; //-> 33
};
age.on( "change", handler );
age( 34 );
age.off( "change", handler );
Parameters
- eventType {String}:The name of the event to bind on, usually change.
- handler {function(event, args...)}:The handler to be removed. This has to be the same function that was passed to on. 
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