IRI code urlencodes get parameters

By default the url for get requests get pushed through the IRI parser/seraliser/normaliser. That class passes the query parameters through the replace_invalid_with_pct_encoding function which replaces [ and ] with %5B and %5D.

This makes PHP not recognize it as an array anymore and breaks my API calls.

For example the original url:

http://example.com/?test[a]=1&test[b]=2

Becomes the following in PHP:

$_GET['test']['a'] = 1;
$_GET['test']['b'] = 2;

but with the IRI rewrite it becomes:

$_GET['test%5Ba%5D'] = 1;
$_GET['test%5Bb%5D'] = 2;

Start by tracing GET request URLs through the IRI parser, serializer, and normalizer, especially replace_invalid_with_pct_encoding. Reproduce the example with bracketed query parameters and inspect the existing URL or IRI tests. Done means the request preserves the PHP-style array parameters while retaining correct handling of other invalid query characters.