image url is error with :thumbnail while use_timestamp is set true

[xbin999]

While use_timestamp is set true, I use <%= qiniu_image_tag @image.file.url, :thumbnail => '100x100>' %>

and get the bad url like http://7xkty5.com1.z0.glb.clouddn.com/books/covers/4/harrypotter1.jpg?1471600951?imageMogr/thumbnail/100x100%3E

How about replace the second ? to & rather than set use_timestamp false?

[mozillo]

See http://developer.qiniu.com/code/v6/api/kodo-api/image/imageview2.html