Monadic ! (til)

Rеturns a range of natural numbers from 0 til the argument (excluding the argument).

Syntax: !<x>; ![<x>]; til <x>; til[<x>]

o)til 1b
,0
o)!10
0 1 2 3 4 5 6 7 8 9
o)til 0
`long$()
o)10+til 5
10 11 12 13 14
o)(til 2)*5
0 5
o)!2*5
0 1 2 3 4 5 6 7 8 9
o)

The argument must be a non-negative integer atom:

o)til 10f
** eval error: `key`:
invalid type: [`s`float]