Stupid enter key. :(
Anyways ... when you have indexed inputs in HTML and load them in form processing via getHttpData($type, 'items[]'), the returned list of elements is indexed with numbers and not with keys it had in HTML representantion.
Since $_POST is indexed via those keys, I'd expect this function to return the same stuff as $_POST, just sanitized (as it was written in that one Nette Forms article), NOT completly different array.