protected function _init() {
		parent::_init();

		$this->_operators += array(
			'like' => function($key, $value) {
				return new MongoRegex($value);
			},
			'$exists' => function($key, $value) {
				return array('$exists' => (boolean) $value);
			},
			'$type' => function($key, $value) {
				return array('$type' => (integer) $value);
			},
			'$mod' => function($key, $value) {
				$value = (array) $value;
				return array('$mod' => array(current($value), next($value) ?: 0));
			},
			'$size' => function($key, $value) {
				return array('$size' => (integer) $value);
			},
			'$elemMatch' => function($operator, $values, $options = array()) {
				$options += array(
					'castOpts' => array(),
					'field' => ''
				);
				$options['castOpts'] += array('pathKey' => $options['field']);
				$values = (array) $values;

				if (empty($options['castOpts']['schema'])) {
					return array('$elemMatch' => $values);
				}
				foreach ($values as $key => &$value) {
					$value = $options['castOpts']['schema']->cast(
						null, $key, $value, $options['castOpts']
					);
				}
				return array('$elemMatch' => $values);
			}
		);
	}