import { Reducer } from "https://deno.land/x/rimbu@1.2.1/core/mod.ts";
const { Base } = Reducer;
Parameters
mapFun: () => O2
value: O,
index: number,
halted: boolean,
import { Reducer } from "https://deno.land/x/rimbu@1.2.1/core/mod.ts";
const { Base } = Reducer;