parser discards first empty value in array

[t-yamo]

Hi, I use this awesome library. But there is one wonder point.

var qs = require("qs");
console.dir(qs.parse("x[]=")); // case1
console.dir(qs.parse("a[]=&a[]=b&a[]=c")); // case2
console.dir(qs.parse("a[]=b&a[]=&a[]=c")); // case3
console.dir(qs.parse("a[]=b&a[]=c&a[]=")); // case4

{ x: [ '' ] }
{ a: [ 'b', 'c' ] }
{ a: [ 'b', '', 'c' ] }
{ a: [ 'b', 'c', '' ] }

Is case2 expected value?