prevent saving when last_modified out of sync
prevent saving when last_modified out of sync

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