bar shape doesn't scale to exact position

[netil]

Description

For some scale, bar shape doesn't reflect correctly matching the grid line which represent same data value.
The y grid indicates 10 billion position and the data values is same, but it doesn't touch to the grid line having little gap.

Steps to check or reproduce

bb.generate({
	data: {
		type: "bar",
		columns: [
			[
				"data1",
				-10000000000,
			]
		],
	},
	axis: {
		y: {
			min:-20000000000,
			max: 10000000000,
			tick: {
				stepSize: 5000000000,
			},
			padding: 0,
		},
	},
	bar: {
		width: 10,
		radius: 2
		
	},
	size: {
		height: 199,
	},
	grid: {
		y: {
			show: true,
		},
	},
	legend: {
		show: false,
	}
});