0.9.3.13:

0.9.3.13:
 -- Make list-remove-duplicates use a hash table only if the number
    of items to traverse is more than 20.
 -- Add special case routine LAST1 (equivalent to single argument
   call to LAST) and have NCONC call this instead of the general
   function.
 -- Add a special two-argument form of NCONC, called NCONC2. TODO:
    add a source transform to call this.