ConstraintManager
An internal Unity system that evaluates all of the “Constraint” components in a scene1).
Beyond applying the constraint the ConstraintManager also sorts constraints based on dependencies, in order to avoid drift caused by non-optimal order of evaluation.
The sorting and evaluation happens in PreLateUpdate.ConstraintManagerUpdate, and is mildly jobified.
1)
ie. PositionConstraint, RotationConstraint, etc