HTML5 canvas ellipse draws incorrectly

Question

HTML5 Canvas seems to have an error when drawing an ellipse. Consider this simple example:

For me this occurs in Chrome and Opera, but not Firefox or Safari.

var ctx = document.getElementById("canvas").getContext("2d");

function draw(val) {
  ctx.moveTo(160, 110);
  ctx.lineTo(val, 60.1418);
  ctx.closePath();
  ctx.ellipse(110, 110, 50, 50, 0, 4.63705, 0, true);
  ctx.stroke();
}
draw(106.2367);
//draw(106.236);

<canvas id="canvas" width="200" height="200" />

I get the following image as a result:

And if I simply replace draw(106.2367) with draw(106.236), I get a completely different result:

I know this issue can be fixed by removing ctx.closePath(), but I want to know why this happened in the first place. Is this a bug?