point.distanceTo can return NaN when measuring small/no distances

[stensrud]

Measuring the distance from [60.512651558965445, 6.67020027525723] to [60.512651558965445, 6.670200191438198] returns a NaN result.

The expression Math.sin(lat1) * Math.sin(lat2) + Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon1 - lon2) gives a result of 1.0000000000000002 which is not defined for the arccosine function Math.acos to which this result is sent.

[jgburet]

We have this problem when passing the same coordinates for the two points we are comparing.
It's kind of funny that it returns NaN when passing inKilometers boolean to true, while it is working perfectly with miles.