Middleware cannot access context.params when nested

[N8Brooks]

For example some slight modifications for the example in the README

import { Application, Router } from "https://deno.land/x/oak/mod.ts";

const posts = new Router()
  .use(async (ctx, next) => {
    console.log(ctx.params); // {}
    await next();
  })
  .get("/", (ctx) => {
    console.log(ctx.params); // {forumId: string}
  });

const forums = new Router()
  .use("/forums/:forumId/posts", posts.routes(), posts.allowedMethods());

await new Application()
  .use(forums.routes())
  .listen({ port: 8000 });

Actual Behaviour

• When accessing ctx.params from the middleware it is an empty object. Since it is available at all I would expect the params to exist.

Expected Behaviour

• When accessing ctx.params from the middleware it has an object containing the forumId property. This is different than the ctx.params in the routes.

Details

• Oak v10.0.0
• Not sure if this is a bug/feature request/expected behaviour.
• This functionality could be useful if there is some common behaviour applied to forumId across the nested routes.