Fade in/out sometimes never resolves

[alvov]

There can be a case when fading in/out will never resolve.

Inside _startFadeInterval method vol is first clamped to the to value, and then is rounded:

        // Make sure the volume is in the right bounds.
        if (diff < 0) {
          vol = Math.max(to, vol);
        } else {
          vol = Math.min(to, vol);
        }

        // Round to within 2 decimal points.
        vol = Math.round(vol * 100) / 100;

In case to is a float like 0.901, then vol might first be assigned with 0.901, and then rounded to 0.9. After that the vol >= to check would fail, and runtime would fall into infinite loop.

I assume this could be fixed by moving rounding higher above the clamping part.

[goldfire]

Nice catch, thanks for the PR!