Currently, the custome user claims can be updated with setCustomUserClaims(), and the user details can be updated with updateUser().

Both use same /accounts:update REST API under the hood.

Is there a particular reason why the updateUser() method does not allow updating the custom claims even though it is possible in the underlying REST API? A follow up point is: if the updateUser() method has this functionalitly, then the setCustomUserClaims() would become obsolete (just a convenience wrapper).

I'd like to be able to include a customClaims field in the UpdateRequest interface, so that, if needed, we can update the user's details and claims in a single request. Currently we need two separate network requests to do this.

Let me know, and I can help with a PR if you want.