Create an object id. The input is expected to be either a string in the format "n.n.n.n.n.n" or an array of integers.
Returns an index based on the difference between this ObjectId and the provided parent ObjectId.
For example, ObjectId.new("1.3.6.1.5").index("1.3.6.1") returns an ObjectId of "5".
Returns true if this ObjectId is a subtree of the provided parent tree ObjectId. For example, "1.3.6.1.5" is a subtree of "1.3.6.1".
[Validate]