Async validator question

Hi,

Is there a way to check if a changeset has changed since it was last validated?

Ideally setting any prop: `changeset.set('prop', 1)` will turn `changeset.get('isValid')` false, until all validators (async here is the issue) resolve.

This would allow us to disable UI until we know for certain that everything is resolved and valid.

Currently, if there is a slow async validator, the changeset will be in `isValid` true, but in reality, it is still unresolved, and therefor, the user may proceed to submit and then the world falls apart.

Let me know what you think.

Thanks