[BUG]: Phalcon\Storage\Serializer\Igbinary not saving is_numeric()/bool values

[Aphexx]

Describe the bug
The Igbinary serializer storage adapter is not saving bool and is_numeric() values, because of
isSerializable() check at Phalcon\Storage\Serializer\Igbinary->serialize() function.

cphalcon/phalcon/Storage/Serializer/Igbinary.zep

Line 20 in 3241d96

if !this->isSerializable(this->data) {

isSerializable() function checks for is_numeric/boolean in value that need to be saved and skips igbinary_serialize() for it. After that raw value fails to igbinary_unserialize() and cache->get() returns null.

POC

$apcCache = new \Phalcon\Cache\Adapter\Apcu(new \Phalcon\Storage\SerializerFactory(), [
            'defaultSerializer' => 'Igbinary',
]);

$key = 'cache-key';
$val = '100';
$apcCache->set($key, $val, 10);
var_dump($val);   // 100
var_dump($this->apcCache->get($key)); // null  <------- SHOULD BE SAME VALUE

// Correct cache save/retrieve with non numeric string 
$val = 'i_am_string';
$apcCache->set($key, $val, 10);
var_dump($val);   // i_am_string
var_dump($this->apcCache->get($key)); // i_am_string <---- correct behavior

Solution
All values should be serialized with igbinary_serialize(). Remove isSerializable() check from Phalcon\Storage\Serializer\Igbinary->serialize() function.

Details
Phalcon version: 4.1.0
PHP Version: PHP 7.3
Zephir version (if any): No

[niden]

@Aphexx Thank you for reporting this.

Resolved in #15342