Seems I was wrong with that the HTML spec doesn’t say anything about form submission order. Obviously, it does (http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4).
Thank you for the correction. 
I’m not sure all browsers conform to the spec. I remember having issues with IE 5 a few years ago.
Spec compliance problems with Internet Explorer? Shocked, shocked I am to hear this 
I don’t think its quite so obvious…
What I read there (and of course this is up to opinion) is that the form names and its corresponding value(s) are in order. But, I do not see anything about the values having to be in order for a specific form name. (I could see that having the values in order MIGHT be implied with the statement “The control names/values are listed in the order they appear…”, but I would think having the values in order would be spelled out in a specification like this…)
Also, there would have to be trust in the web container, client browser, etc, that everything is following the spec. I would say it is smarter/safer to label each form name to be unique as I stated previously in this thread. Why take the chance when a little extra code isn’t that difficult? I don’t get it?
Best of Luck.
I don’t disagree. If you know what can happen using POST “arrays” the wise choice would be not to go down that road.