Cannot store number 0 by file cache

[zxz054321]

like these codes:

$cache = new BackFile(
            new FrontOutput(["lifetime" => 6 * 3600]),
            ['cacheDir' => $dir]
);

$cache->save('counter', 0); 

Phalcon will only create an empty file named counter
A 0 should be placed in the file!

Environment

• Windows 10
• XAMPP
• Phalcon 2.0.9

[sergeyklay]

Fixed in 2.0.x