Problem with nested arrays in objects

[ciprianpratia]

I have encountered the following case:
filter[id_test][type]=in&filter[id_test][filter][0]=1&filter[id_test][filter][1]=2&filter[id_test][filter][2]=3&filter[id_test][filter][3]=4&filter[id_test][filter][4]=5&filter[id_test][filter][5]=6&filter[id_test][filter][6]=7&filter[id_test][filter][7]=8&filter[id_test][filter][8]=9

Should be parsed to { type: 'in', filter: [1,2,3,4,5,6,7,8,9]},
Instead i get filter: {0:0, 1:1, 2:2, ... 9:9}