Phalcon\Db\Profiler\Item->getSQLVariables appears to always be empty.

Expected and Actual Behavior

\Phalcon\Db\Profiler\Item->getSQLVariables() is expected to return a list of variables used in the profile's SQL statement bound parameters. This doesn't appear to be true.

Relevant di configuration:

$di->setShared('profiler', function () {
    return new \Phalcon\Db\Profiler();
});
$di->setShared('db', function() use ($di) {
    $connection = new Connection(array(
        "host" => $db_creds->host,
        "username" => $db_creds->username,
        "password" => $db_creds->password,
        "dbname" => $db_creds->dbname,
    ));
    $eventsManager = new Phalcon\Events\Manager();
    $profiler = $di->getProfiler();
    $eventsManager->attach('db', function ($evt, $conn) use ($profiler) {
        if ($evt->getType() === "beforeQuery") {
            $profiler->startProfile($conn->getSQLStatement());
        }
        if ($evt->getType() === "afterQuery") {
            $profiler->stopProfile();
        }
    });
    $connection->setEventsManager($eventsManager);
    return $connection;
});

This is in a controller afterExecuteRoute()

// in the example below, an insert was successful on the books table at this point.
$profiles = $this->profiler->getProfiles();
foreach ($profiles as $profile) {
    error_log(
        "SQL Statement: ". $profile->getSQLStatement() .
        " with variables " . $profile->getSQLVariables() .
        " Total Elapsed Time: ". $profile->getTotalElapsedSeconds()
    );
}

Output:

[Wed Oct 19 15:17:22.804249 2016] [:error] [pid 23792] [client 98.191.80.75:47708] SQL Statement: INSERT INTO `books` (`full_name`, `summary`, `vendor_id`, `category_tag_id`, `date_created`, `banner`, `thumbnail`, `activated`) VALUES (?, ?, ?, ?, ?, ?, ?, DEFAULT) with variables  Total Elapsed Time: 0.00037097930908203, referer: REDACTED

Details

Phalcon version: (php --ri phalcon)

~$ php --ri phalcon

phalcon

Web framework delivered as a C-extension for PHP
phalcon => enabled
Author => Phalcon Team and contributors
Version => 3.0.1
Build Date => Sep  1 2016 18:08:54
Powered by Zephir => Version 0.9.4a-dev-7e304ba18c

Directive => Local Value => Master Value
phalcon.db.escape_identifiers => On => On
phalcon.db.force_casting => Off => Off
phalcon.orm.events => On => On
phalcon.orm.virtual_foreign_keys => On => On
phalcon.orm.column_renaming => On => On
phalcon.orm.not_null_validations => On => On
phalcon.orm.exception_on_failed_save => Off => Off
phalcon.orm.enable_literals => On => On
phalcon.orm.late_state_binding => Off => Off
phalcon.orm.enable_implicit_joins => On => On
phalcon.orm.cast_on_hydrate => Off => Off
phalcon.orm.ignore_unknown_columns => Off => Off

PHP Version: (php -v)

~$ php -v
PHP 5.5.9-1ubuntu4.20 (cli) (built: Oct  3 2016 13:00:37) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with the ionCube PHP Loader v4.7.5, Copyright (c) 2002-2014, by ionCube Ltd., and
    with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies

Operating System:

~$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.5 LTS"

Installation type:

~$ cat /etc/apt/sources.list.d/phalcon_stable.list 
deb https://packagecloud.io/phalcon/stable/ubuntu trusty main

Zephir version (if any): N/A

Server:

~$ apache2 -version
Server version: Apache/2.4.7 (Ubuntu)
Server built:   Jul 15 2016 15:34:04

Other related info (Database, table schema):

~$ mysql --version
mysql  Ver 14.14 Distrib 5.5.52, for debian-linux-gnu (x86_64) using readline 6.3