A method of providing access to {TAIL ~ a dataset} in a type safe manner includes storing a dataset including a plurality of {HEAD ~ data elements} and a corresponding plurality of order keys for indicating an ordering of the data elements 
A method of providing access to { TAIL ~ a dataset } in a type safe manner includes storing a dataset including a plurality of { HEAD ~ data elements } and a corresponding plurality of order keys for indicating an ordering of the data elements
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH