* Decodes a lossless chunk header
* @param string $header First few bytes of the header, expected to be at least 13 bytes long
* @return bool|array See WebPHandler::decodeHeader
+ * @suppress PhanTypeInvalidLeftOperandOfIntegerOp
*/
public static function decodeLosslessChunkHeader( $header ) {
// Bytes 0-3 are 'VP8L'