Returns a Seq.Indexed of numbers from start (inclusive) to end
(exclusive), by step, where start defaults to 0, step to 1, and end to
infinity. When start is equal to end, returns empty range.
Range(start?: number, end?: number, step?: number): Seq.Indexed<number>
Range() // [0,1,2,3,...]
Range(10) // [10,11,12,13,...]
Range(10,15) // [10,11,12,13,14]
Range(10,30,5) // [10,15,20,25]
Range(30,10,5) // [30,25,20,15]
Range(30,30,5) // []