CiviCRM Profile - User Framework Fields Required Property Not Enforced

CiviCRM Profile fields can be marked is_required = TRUE in admin - but this property is not enforced properly when editing the user account. Also not enforced when creating a new account (registering). Observed behavior when editing user 1 and completing only First Name (not Last Name which is also required) is that the no validation error was returned - AND the submitted First Name value was not saved to the contact record.

Custom fields can also now be 'mapped' to CiviCRM Profile fields (and hence exposed in user account edit/view). Please verify that the fix works for both 'core' and 'custom' fields.