import { Bson } from "https://deno.land/x/mongo@v0.31.0/mod.ts";
const { BufReader } = Bson;
return new BufReader unless r is BufReader
import { Bson } from "https://deno.land/x/mongo@v0.31.0/mod.ts";
const { BufReader } = Bson;
return new BufReader unless r is BufReader