Form url encoded params should work as in PHP and RoR

[fxgallego]

Actually form url encoded params are interpreted as arrays when a param name is duplicated. For example 'foo=bar&foo=barz' is parsed as 'foo' -> ['bar', 'baz'].

In PHP and Rails in order to pass an array in params the parameters should be written as 'foo[]=bar&foo[]=barz'. If the param name doesn't includes [] at end then duplicated params overwrites previous values in order of appearance.