Directory with `5.0` in path always serves 404

Lovely library - thank you for building it! I ran into a rather bizarre problem when trying to debug JustinBeckwith/linkinator#233. There is a route that looks like http://localhost:3000/docs/5.0/ which always returns a 404, even with an index.html in that local directory. I have a full simple reproduction here:
https://github.com/JustinBeckwith/serve-bug

The code is simple enough:

const http = require('http');
const serve = require('serve-handler');

http.createServer((req, res) => {
  return serve(req, res, {
    public: '.',
    directoryListing: false,
  });
})
.listen(3000);

With a directory structure like this:

/
  docs/
    normal/
      index.html
    6/
      index.html
    5.0/
      index.html

The routes that go to docs/normal and docs/6 work - only the 5.0 route causes a 404. Please do let me know if there's anything else I can do to help with a reproduction.

cc @XhmikosR

@JustinBeckwith I had a quick look at this and it seems we need

to set renderSingle: true
and change the === 1 check to >= 1 here:

serve-handler/src/index.js

Line 342 in c7a4043

const canRenderSingle = renderSingle && (files.length === 1);

Then linkinator is passing here:

> bootstrap@5.0.0-beta1 docs-linkinator C:\Users\xmr\Desktop\bootstrap
> linkinator _gh_pages --recurse --silent --skip "^(?!http://localhost)"

🏊‍♂️ crawling _gh_pages
renderSingle: true
canRenderSingle: true
files.length: 15
🤖 Successfully scanned 700 links in 2.942 seconds.

docs/5.0/ contents:

 Directory of C:\Users\xmr\Desktop\bootstrap\_gh_pages\docs\5.0

25/01/2021  14:58    <DIR>          .
25/01/2021  14:58    <DIR>          ..
25/01/2021  14:58    <DIR>          about
25/01/2021  14:58    <DIR>          assets
25/01/2021  14:58    <DIR>          components
25/01/2021  14:58    <DIR>          content
25/01/2021  14:58    <DIR>          customize
31/08/1754  00:43    <DIR>          dist
25/01/2021  14:58    <DIR>          examples
25/01/2021  14:58    <DIR>          extend
25/01/2021  14:58    <DIR>          forms
25/01/2021  14:58    <DIR>          getting-started
25/01/2021  14:58    <DIR>          helpers
25/01/2021  14:58               498 index.html
25/01/2021  14:58    <DIR>          layout
25/01/2021  14:58    <DIR>          migration
25/01/2021  14:58    <DIR>          utilities

I haven't tested it with unit tests since I'm having trouble setting up the repo on vanilla Windows 10.

@styfle friendly CC in case you can help us here :)

EDIT: Alternatively, maybe the check should look for other sibling folders too or something?
EDIT2: BTW this might be a duplicate of #120?

Thanks for the repro steps!

Indeed, this does look like a duplicate of #120 so I'll close this one.