def Nar.read.if
import bend-kit-int@0.2.0.0/int.bend as Intimport Base
573def Nar.read.if(ok: Bool, +r: U32, +m: U32, s: String) -> Maybe<&2, U32>:
574 match ok:
575 case True{}:
576 Nar.read.split(r, m, Radix.sign(s))
577 case False{}:
578 None{}