Three Supermarkets Spell One Brand Three Ways, So My Price Comparison Never Happened

Coles, Woolworths and ALDI publish the same 2L of a2 milk under three different brand strings. My comparison matcher used string equality, so the same jug came back as three separate rows and the comparison it exists to produce silently did not happen. Here is what 46 real rows taught me, and the three fixes I shipped today.