public function update_item( $request ) {
		$id = (int) $request['id'];

		$user = get_userdata( $id );
		if ( ! $user ) {
			return new WP_Error( 'rest_user_invalid_id', __( 'Invalid resource id.' ), array( 'status' => 404 ) );
		}

		if ( email_exists( $request['email'] ) && $request['email'] !== $user->user_email ) {
			return new WP_Error( 'rest_user_invalid_email', __( 'Email address is invalid.' ), array( 'status' => 400 ) );
		}

		if ( ! empty( $request['username'] ) && $request['username'] !== $user->user_login ) {
			return new WP_Error( 'rest_user_invalid_argument', __( "Username isn't editable." ), array( 'status' => 400 ) );
		}

		if ( ! empty( $request['slug'] ) && $request['slug'] !== $user->user_nicename && get_user_by( 'slug', $request['slug'] ) ) {
			return new WP_Error( 'rest_user_invalid_slug', __( 'Slug is invalid.' ), array( 'status' => 400 ) );
		}

		if ( ! empty( $request['roles'] ) ) {
			$check_permission = $this->check_role_update( $id, $request['roles'] );
			if ( is_wp_error( $check_permission ) ) {
				return $check_permission;
			}
		}

		$user = $this->prepare_item_for_database( $request );

		// Ensure we're operating on the same user we already checked
		$user->ID = $id;

		$user_id = wp_update_user( $user );
		if ( is_wp_error( $user_id ) ) {
			return $user_id;
		}

		$user = get_user_by( 'id', $id );
		if ( ! empty( $request['roles'] ) ) {
			array_map( array( $user, 'add_role' ), $request['roles'] );
		}

		$schema = $this->get_item_schema();
		if ( ! empty( $schema['properties']['meta'] ) && isset( $request['meta'] ) ) {
			$meta_update = $this->meta->update_value( $request['meta'], $id );
			if ( is_wp_error( $meta_update ) ) {
				return $meta_update;
			}
		}

		$fields_update = $this->update_additional_fields_for_object( $user, $request );
		if ( is_wp_error( $fields_update ) ) {
			return $fields_update;
		}

		/* This action is documented in lib/endpoints/class-wp-rest-users-controller.php */
		do_action( 'rest_insert_user', $user, $request, false );

		$request->set_param( 'context', 'edit' );
		$response = $this->prepare_item_for_response( $user, $request );
		$response = rest_ensure_response( $response );
		return $response;
	}