Vector*matrix in 0.6

[andyferris]

@dlfivefifty

if we’ve held out 78 years, you’re unlikely to convince us now

lol. Fair point.

I still think on pen-and-paper (in say a first-year maths class) you’d squirm at B = v.A but not B = v.wᵀ, but I don’t care so much on this particular point to hold out.