Strict Routing

I've been experimenting with strict routing using `express@latest` and have found that the following the requests all route to the same path when supplying `strict: true` to express. This doesn't seem to uphold the docs explanation of `Disabled by default, “/foo” and “/foo/” are treated the same by the router.`.

```js
const express = require('express')
const app = express({ strict: true })
const port = 3022

app.get('/:param?/', (req, res) => res.json(req.params.param));

app.listen(port);
```

```
> curl -I http://localhost:3022/
HTTP/1.1 200 OK

> curl -I http://localhost:3022/abc
HTTP/1.1 200 OK

> curl -I http://localhost:3022/abc/
HTTP/1.1 200 OK
```