When POSTing a resource with a sib-form, save event does not return the new @id

When we POST a new resource in a container, the save event returns the content of the form:
https://git.happy-dev.fr/startinblox/framework/sib-core/blob/master/src/components/sib-form.ts#L119

It means that we cannot access the @id of the created resource (which does not exist yet).

Instead, it should return the response of the server, where the newly created @id would be available.
Do you think it's the right way @sylvain @jbpasquier?