wp_update_user() and wp_insert_user() should accept WP_User

[ryan]

These functions currently accept only an array of user data. This encourages using wp_update_user( get_object_vars( $user ) ). If $user happens to be a WP_User instance, this will fail since WP_User doesn't declare object vars. wp_update_user() and wp_insert_user() should accept WP_User and handle running get_object_vars() on WP_User::data.

[nacin]

Looks good at a glance. to_array(), or maybe actually call it get_object_vars()?

[ryan]

In [21496]:

Allow passing stdClass and WP_User to wp_insert_user() and wp_update_user(). Introduce WP_User::to_array(). Eliminate uses of get_object_vars() when passing to wp_*_user(). fixes #21429

[ryan]

​[UT960]