only allow `object` in channels.next()
only allow `object` in channels.next()

nteract/nteract,rgbkrk/nteract,nteract/composition,rgbkrk/nteract,rgbkrk/nteract,nteract/nteract,rgbkrk/nteract,nteract/composition,nteract/nteract,nteract/composition,nteract/nteract,rgbkrk/nteract,nteract/nteract