getVelocityAtWorldPoint() requires result parameter, despite returning result

[gnbl]

getVelocityAtWorldPoint requires result as parameter, despite returning result.

// unexpected
let v = body.getVelocityAtWorldPoint( point );
>> Uncaught TypeError: vector is undefined

// workaround
let v = new CANNON.Vec3();
body.getVelocityAtWorldPoint(point, v);

It would be more consistent with the rest of the methods if the result parameter were optional.

[gnbl]

Passing a dummy Vec3 is easier to read:

let v = body.getVelocityAtWorldPoint(point, new CANNON.Vec3());