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