THREE.Box3 bug?

I believe I’ve found a bug with the THREE.Box3 class, and would like someone to help me find out if I missed a step before submitting it to Github.

Whenever I create new THREE.Box3(), its limits range are by default from -Infinity to +Infinity, according to the docs. With that in mind, using .clampPoint() with these limits should perform no clamping whatsoever. Here’s my code:

// This box should have bounds of 
// min: -Infinity
// max: +Infinity
var boundingBox = new THREE.Box3();
var sourceVector = new THREE.Vector3(-5, 10, 3);
var clampedVector = new THREE.Vector3();

// This shouldn't perform any clamping,
// since limits are infinity
boundingBox.clampPoint(sourceVector, clampedVector);

// However, this outputs
// { x: Infinity, y: Infinity, z: Infinity }
console.log(clampedVector);

You can see this bug in action in this fiddle.

I believe the source of this bug is on lines 11 and 12: https://github.com/mrdoob/three.js/blob/dev/src/math/Box3.js#L11 because min is assigned +Infinity, and max is assigned -Infinity, but it should be the opposite. This leads to wrong results when the Vec3 is being clamped

If you do this, Box3.expandByPoint() does not work anymore. And this method is actually more important since it is used to construct the bounding volume from a set of points or from an object.

I suggest to handle this edge case in Box3.clampPoint().