z-index option ignored

[PierreRAFFA]

Hi guys,
I noticed an issue with the option zIndex. This option seems to be ignored while it is replaced by a default value 9999.
Here are the options I am using for my draggable element:
data-jqyoui-options="{appendTo: 'body', revert: 'invalid', helper: 'clone', revertDuration:250, cursorAt:{top:'3', left:'3'}, zIndex: 10009}"

Are the options correct ? If yes, any chance to fix this issue ?
I can contribute if needed.
Thanks.