fix bug, when formatSubmit was improperly appending suffixes

[dylanjha]

• for example a name like order[date] would incorrectly be changed
  to order[date]_submit
• in this example, the input should have the name order[date_submit]

[dylanjha]

@amsul if you like this change, I can write a test for it. figured I would put in the PR first before I spend more time on it 😃 . thanks for maintaining this library, I'm diggin it! 👍

[amsul]

I really appreciate the contribution and kind words :)

I apologize for the delayed response with this. But now that I look at it, it seems it’s trying to solve the same problem that led to the introduction of the hiddenPrefix option: #209.

And now with the suggestion to remove the visible input’s name and use that as the hidden input’s name (#377), it makes me feel like this is no longer necessary.

In my opinion, I agree with @psorowka about the server not needing to be aware of changes by a 3rd party client-side plugin. The vice-versa should be true as well.

If this hidden prefix is causing any trouble, it can just be set to false and everything should sail smoothly. I’d like to hear any counter thoughts you might have on this.

Cheers!