def decimal.step
import bend-kit-camber@0.15.0.1/input.bend as Inputimport Base
16def decimal.step(ok: Bool, +acc: U32, digit: U32, next: U32 -> Maybe<&2, U32>) -> Maybe<&2, U32>:
17 match ok:
18 case False{}: None{}
19 case True{}: next((acc * 10 + digit : U32))