fix array query params

[yenh-cs]

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[sinedied]

Thanks for your PR, and sorry for taking so long to answer.
I took some time to look into this, and honestly I'm not sure what would be the best way to have array params parsing.

The solution you provided works for some languages/framework (PHP or Node.js for example) but not is invalid for some others (.Net), and there's no standard way of parsing array params. There's lot of example in this discussion here: https://stackoverflow.com/questions/6243051/how-to-pass-an-array-within-a-query-string

You proposal might be a good default behavior though, but before merging it I would like to find a way to support others methods of array parsing as an option (probably only when using JS mocks) to supports the cases when the proposed solution will fail.