GD2库是否在想象Yii核心框架，支持GIF多层（动画）？

Question

此代码返回＆＃34; 1＆＃34;总是！

\yii\imagine\Image::$driver = [\yii\imagine\Image::DRIVER_GD2];
$imagine = \yii\imagine\Image::getImagine();
$image = $imagine->open('image.gif');
echo count($image->layers()) . " layers";

imagine Yii核心框架中的GD2库是否支持GIF多层（动画）？