drupal_get_query_array should urldecode keys as well

$url = "http://my.site.com/some_path?foo%26bar=42&foo=20&bar=22";
$parsed = parse_url($url);
$query = $parsed['query'];
$array = drupal_get_query_array($query);
$url_back = drupal_http_build_query($array);

var_dump($array);
var_dump($url_back);
// OUTPUT
// array(3) {
//   ["foo%26bar"] => string(2) "42"
//   ["foo"] => string(2) "20"
//   ["bar"] => string(2) "22"
// }
// string(28) "foo%2526bar=42&foo=20&bar=22"

Since drupal_http_build_query is rawurlencoding both the keys and values given to it in the $query array,

// line 490 in includes/common.inc
$key = ($parent ? $parent . '[' . rawurlencode($key) . ']' : rawurlencode($key));

it would seem logical that drupal_get_query_array, which seems to be to opposite function of drupal_http_build_query, is rawurldecoding the keys as well.
However, because it does not rawurldecode the keys, the example above does not result back in the original url, but has a double encoded "%".