Previously we only have _repr_png_, so we can always display RGBA in ipython. now we also have _repr_jpg_ for some reason, the default way to display it is this jpg ...

This works fine: gb.op.plus_times(m @ m.T) and a nice view of the expression shows up in the notebook. But without inclusion in the semiring, m @ m.T gets into a state where it knows it is a ...