def u32.lead
import bend-net-json@0.3.0.0/json.bend as Jsonimport Base
557def u32.lead(+c: U32, t: String, zero: Bool) -> Maybe<&2, U32>:
558 match zero:
559 case True{}:
560 u32.zero(t)
561 case False{}:
562 u32.dig(t, (c - 48 : U32), Bool.or(Bool.not(digit(c)), u32.over(0, c)))