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fixes part of #179 - it works now with heatmap (and in fact any SVG type that makes a colorbar, like bubble charts). The chart it makes looks a bit weird (the colorscale should be smooth, and the ticks should be evenly spaced), but I think that's probably a good thing, as it will alert the user that they're at the limit of javascript's precision.
Resulted in a few sub-pixel changes in baselines, I think they're fine but I notice we're not doing crisp rendering of colorbars - particularly the outlines, but line levels should probably be crisp too - so I will make an issue for that look at this again afterward.