def exp.part
import bend-toon-codec@0.1.0.0/src/num.bend as Numimport Base
import bend-toon-codec@0.1.0.0/src/head.bend as Hd
85# After `e`: an optional sign, then digits.
86def exp.part(+neg: Bool, +ip: String, +fp: String, +s: String) -> Maybe<&2, Num>:
87 exp.part.pick(Hd.lead(s, 43), Hd.lead(s, 45), neg, ip, fp, s)