Pass String array from .ftl task form

[kamilfo]

How can I submit String array from .ftl form? And which type of task variable should I use?

On my form I tried this variants:

1) <input type="text" name="out_x" id="txt1"/></div>

    <input type="text" name="out_x" id="txt2"/></div>

- but in this case my form is submitted with only last "out_x" value from field "txt2"

2) <input type="text" name="out_x[0]" id="txt1"/></div>

    <input type="text" name="out_x[1]" id="txt2"/></div>

- in this case nothing is submitted to my task variable out_x at all

I tried to declare task variable out_x as:

1)

2)

3)

Is it possible at all?

Thanks for your help!