Description
A query string for keys with multiple values is generated as key[]=value1&key[]=value2 using http_build_query internally. Some endpoints only accept keys without brackets. It would be nice to add an option to generate the other format as well.

Example
A query string for the key foo with values bar and baz can be generated either as foo[]=bar&foo[]=baz (current behaviour) or foo=bar&foo=baz (new feature).