Description:
------------
It seems that the NumberFormatter is not able to parse its own Output. 

Reproduce code:
---------------
<?php

/*

# locale -a | grep de_DE
de_DE.ISO8859-1
de_DE.ISO8859-15
de_DE.UTF-8

*/
/* ########################### */

$en_locale="en_US.UTF-8";
$de_locale="de_DE.UTF-8";

/* ########################### */

echo setlocale(LC_ALL, $en_locale) . '<br/>';
$fmt = new NumberFormatter($en_locale, NumberFormatter::DEFAULT_STYLE );

$string  = $fmt->format(1234.56);
$numeric = $fmt->parse($string);

var_dump($string);
echo '<br/>';
var_dump($numeric);

echo '<br/>';
echo setlocale(LC_ALL, $de_locale) . '<br/>';
$fmt = new NumberFormatter($de_locale,  NumberFormatter::DEFAULT_STYLE);

$string  = $fmt->format(1234.56);
$numeric = $fmt->parse($string);

var_dump($string);
echo '<br/>';
var_dump($numeric);

highlight_file(__FILE__);

?>

Expected result:
----------------
en_US.UTF-8
string(8) "1,234.56"
float(1234.56)
de_DE.UTF-8
string(8) "1.234,56"
float(1234.56)

Actual result:
--------------
en_US.UTF-8
string(8) "1,234.56"
float(1234.56)
de_DE.UTF-8
string(8) "1.234,56"
float(0)