Saving fields in array on Laravel

I have a problem when saving text fields in Laravel

in controller, return $_POST; gives:

"positions":{"9":"1","10":"2","11":"3","12":"4","34":"5","13":"6"}

but return $Request::all(); gives:

"positions":["6","5","4","3","2","1"]

Why this happens? I need the array result in the same format as in $_POST variable...

use Request; is on Illuminate\Support\Facades\Request::class, Laravel 5.3

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