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CI 3.0.1 bug with form submit - dmshin - 11-01-2015

When I using form submit it has returned weird result.

a input key name is 'UTF-8' char set string

and here is my code in view file

<form action="http://localhost/array_test/post_print" method="post">

    <input type="hidden" name="アオ" value="blue">
    <input type="hidden" name="アカ" value="red">
    <input type="submit">

and this is a 'post_print' function in array_test file

function post_print()


and it has return 

   [アオ] => blue
   [アカ] => red
   [0] => red

What is [0] key? Where did that came from?

It has appeared with last UTF-8 key's value when I using UTF-8 key.

Is this a bug?