The ObservablePlotOverlapping histogram example is:

Plot.plot({round:true,color:{legend:true},marks:[Plot.rectY(olympians,Plot.binX({y1:"count"},{x:"weight",fill:"sex",mixBlendMode:"multiply"})),Plot.ruleY([0])]})

The rendered chart is unaffected by changing{y1: "count"} to{y2: "count"} (but changing it to{y: "count"} causesrectY to apply an implicitstackY transform).

The SveltePlot equivalent is:

<Ploty={{grid:true }}color={{legend:true }}>    <RectY        {...binX(            {data:olympians,x:'weight',fill:'sex' },            {y:'count'            }        )} />    <RuleYdata={[0]} /></Plot>

which renders like:

Changing toy1: 'count' makes it match the apeparance of the ObservablePlot plot:

I wanted to flag this discrepancy, but my first thought is that what SveltePlot does might be more reasonable.

(this is one of the issues surfaced by#72)