[.deflist               Subset a deflist object
[<-.deflist             Prevent assignment to elements in a deflist
                        object
[[.deflist              Retrieve an element from a deflist object
[[<-.deflist            Prevent assignment to an element in a deflist
                        object
as.list.deflist         Convert a deflist object to a list
deflist                 Create a deferred list
length.deflist          Retrieve the length of a deflist object
