Optional bfstrue if you want to traverse in a breadth-first manner. This will cause the mutation function to be called first with the root schema, moving down the subschemas until the terminal subschemas.
Optional mergeSet this to true if you want to merge the returned value of the mutation function into the original schema.
Optional mutabletrue if you want the original schema that was provided to be directly modified by the provided mutation/merge function To preserve cyclical refs this is necessary.
Optional skipSet this to true if you don't want to call the mutator function on the root schema.
The options you can use when traversing.