if(p1===x.bins.length)throw new Error('Cannot subtract');if(x.bins[p1].max!==y.bins[p2].max){throw new Error('Incompatible bins');}
if(x.bins[p1].count<y.bins[p2].count){throw new Error('Cannot subtract');}
x.bins[p1].count-=y.bins[p2].count;for(const event of y.bins[p2].events){x.bins[p1].events.add(event);}