[ ] until: Given an integer, returns a slice of counting integers from 0 to one
less than the given integer: range $i, $e := until 5
[ ] untilStep: Given start, stop, and step, return an integer slice starting at
'start', stopping at stop, and incrementing by 'step. This is the same
as Python's long- [ ]form of 'range'.
range $i, $e := until 5stop, and incrementing by 'step. This is the same as Python's long- [ ]form of 'range'.