code: func NewDropsondeUnmarshallerCollection(size int) *DropsondeUnmarshallerCollection {
  	var unmarshallers []*DropsondeUnmarshaller
  	for i := 0; i < size; i++ {
  		unmarshallers = append(unmarshallers, NewDropsondeUnmarshaller())
  	}
  
  	log.Printf("dropsondeUnmarshallerCollection: created %v unmarshallers", size)
  
  	return &DropsondeUnmarshallerCollection{
  		unmarshallers: unmarshallers,
  	}
  }
docs: // NewDropsondeUnmarshallerCollection instantiates a DropsondeUnmarshallerCollection,
  // creates the specified number of DropsondeUnmarshaller instances.