Description:
------------
I'm seeing extra characters stuffed into the end of files 'tarred' using ext/phar (both Phar and PharData). I don't _think_ this is normal because tar -xf complains about it when run directly:

C:\sandbox\php5\Debug_TS>tar -xf myphar.phar.tar
tar: Unexpected EOF on archive file
tar: Error exit delayed from previous errors

Zip's fine, I can't tell about Phar but it appears OK.

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

$fname = dirname(__FILE__) . '/myphar.phar.tar';
$phar = new Phar($fname);
$phar->setAlias('myphar');
$phar['index.php'] = '<?php echo "hello world\n"; ?>';
$phar['bulk.txt'] = str_repeat('a', 8000);

$bulk = file_get_contents('phar://myphar/bulk.txt');
var_dump(strlen($bulk));

system("tar -xf $fname");
$bulk = file_get_contents('bulk.txt');
var_dump(strlen($bulk));

?>

Expected result:
----------------
int(8000)
int(8000)

Actual result:
--------------
int(8000)
int(9216)