In PhysicsCharacterController, there is a comment/typedoc documentation that has a typo:
/**
* cosine value of slop angle that can be climbed
* computed as `Math.cos(Math.PI * (angleInDegree / 180.0));`
* default 0.5 (value for a 60deg angle)
*/
maxSlopeCosine: number;
slop should be slope