Re: [whatwg/url] Allow `[` and `]` as URL code-points (Issue #753)

I tested a range of parsers:

* For non-special schemes (which is where URL code points are used in the parser):
   * No one ever escapes `[` and `]` in path, query, and fragment
   * No one ever escapes `[` and `]` in host, but:
      * Only Go, Chrome, Python urlparse accept it
      * Python urllib3, libcurl, and current spec reject it as invalid
      * Node.js' legacy `url` parser does something weird (inserts a `/` before the `[`)
* For special schemes:
   * Only Python urllib3 escapes `[` and `]` in path, query, and fragment
      * FWIW this seems to be a relatively new behavior
   * No one ever escapes `[` and `]` in host, but:
      * Only Go, Chrome, Python urlparse accept it

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