logAxisSplits doesn't terminate with scale agnostic `wheelZoomPlugin` plugin

I wrote a scale agnostic wheelZoomPlugin plugin, that doesn't seem like it would cause a browser freeze.

But after on average one minute of zooming in and out with it, the browser always freezes in the loop in logAxisSplits. I assume that this isn't a problem only I will run into, hence I'm writing this issue.

I was able solve it by adding the following code:

do {
	splits.push(split);
	split = split + foundIncr;

+	let dec = fixedDec.get(foundIncr);
+	if (dec == undefined)
+		break;
	if (logBase == 10)
-		split = roundDec(split, fixedDec.get(foundIncr));
+		split = roundDec(split, dec);

	if (split >= foundIncr * logBase)
		foundIncr = split;

} while (split <= scaleMax);

This isn't a pr, because I'm not sure what the underlying cause is, and it may be better to address that.

Here is the wheelZoomPlugin plugin I used:

function wheelZoomPlugin(opts)
{
	let xfactor = opts.xfactor || 0.75;
	let yfactor = opts.yfactor || 0.75;

	return {
		hooks: {
			ready: u => {

				let over = u.over;
				let rect = over.getBoundingClientRect();

				// wheel scroll zoom
				over.addEventListener("wheel", e => {
					e.preventDefault();

					let {left, top} = u.cursor;

					let xs = e.deltaY < 0 ? xfactor : 2-xfactor;
					let x1 = rect.width - left;
					let x2 = left;
					let nxMax = u.posToVal(left + x1*xs, "x");
					let nxMin = u.posToVal(left - x2*xs, "x");

					let ys = e.deltaY < 0 ? yfactor : 2-yfactor;
					let y1 = rect.height - top;
					let y2 = top;
					let nyMax = u.posToVal(top + y1*ys, "y");
					let nyMin = u.posToVal(top - y2*ys, "y");

					u.batch(() => {
						u.setScale("x", {
								min: nxMin,
								max: nxMax,
						});
						u.setScale("y", {
								min: nyMin,
								max: nyMax,
						});
					});
				});
			}
		}
	};
}

Start at the loop in logAxisSplits, especially the fixedDec.get(foundIncr) lookup, and reproduce the problem with the supplied scale-agnostic wheelZoomPlugin. Determine why repeated zooming leaves the loop non-terminating; done means zooming in and out no longer freezes the browser.