There are some useful cases — for example, if you're taking a rather bloated image as a base and trimming it down with `rm` commands, those will be saved as dif

There are some useful cases — for example, if you're taking a rather bloated image as a base and trimming it down with `rm` commands, those will be saved as differential layers, which will not reduce the size of the final image in the slightest. Only merging will actually "register" these deletions.