def Decimal.frac.if
import bend-kit-bignum@0.1.0.0/decimal.bend as Decimalimport Base
import bend-kit-bignum@0.1.0.0/bigint.bend as Big
139def Decimal.frac.if(z: Bool, n: Big.BigInt, d: Big.BigInt) ->
140 Maybe<&2, Decimal>:
141 match z:
142 case True{}:
143 None{}
144 case False{}:
145 Decimal.frac.run(Decimal.lowest(n, d))