KeyRange.bound constructor
      
      KeyRange.bound(])
     
    
Creates a new key range with upper and lower bounds.
Implementation
factory KeyRange.bound(
  Object lowerBound,
  Object upperBound, [
  bool lowerOpen = false,
  bool upperOpen = false,
]) => IdbKeyRange.bound(lowerBound, upperBound, lowerOpen, upperOpen);