Re: [whatwg/url] Should 'C%3A' or 'C%7C' be interpreted as 'C:' and 'C|'? (#210)

Indeed, but windows drive letters are also already special cased in the URL parsing algorithm and anyone processing the URL appropriately (by decoding any pct-encoded characters prior to using it) can end up with rather unexpected results if they are not being careful.

```js
> var m = new url.URL('file://c%3a/%2e/a/%2e%2e/b')
undefined
> m
URL {
  href: file://c:/b
  protocol: file:
  hostname: c:
  pathname: /b
}

> var m = new url.URL('file:///c%3a/%2e/a/%2e%2e/b')
undefined
> m
URL {
  href: file://c:/b
  protocol: file:
  pathname: /c%3a/b
}
```

I believe it at least warrants some additional consideration.

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