Controlled "deep" validation + observed find children

I have a couple of problems with the current validation engine:

• I have circular references in my view model, so deep never ends.
• I have a list of objects from which one can be chosen; only the chosen one should get validated
• Since choosing the object (by setting an observable to one of the lists objects) the elements to validate in a group change - so it is not enough to just collect once...

I have a draft locally which fixes the first to problems by explicitly telling ko.validation which path to follow when validating. Currently this is done by extending with { followOnValidation: true }.

It will then also subscribe to those extended objects and update the "validatables" for the group correspondingly.

What do you think of that approach?

Start by reading the current validation engine and reviewing the proposed local draft that uses followOnValidation. Reproduce the circular-reference and selectable-object cases, then verify that validation terminates, only the selected object is validated, and group validatables update when the selection changes.