/// frame 0 marked as loaded
/// frame -43 marked as loaded
/// _totalframes marked as loaded
/// _totalframes + 5 marked as loaded
/// frame Infinity marked as loaded
/// frame NaN marked as loaded
/// frame abc marked as loaded
/// frame undefined marked as loaded
/// frame null marked as loaded
/// frame 16000 marked as loaded
/// frame 16001 marked as loaded
/// frame 16002.5 marked as loaded
/// frame 2147483649 marked as loaded
/// target frame 0 marked as loaded
/// target frame -43 marked as loaded
/// target frame Infinity marked as loaded
