WP_Customize_Partial::__construct

	 *                                           a partial's placement.
	 *     @type string[] $settings              IDs for settings tied to the partial. If undefined, `$id` will be used.
	 *     @type string   $primary_setting       The ID for the setting that this partial is primarily responsible for
	 *                                           rendering. If not supplied, it will default to the ID of the first setting.
	 *     @type string   $capability            Capability required to edit this partial.
	 *                                           Normally this is empty and the capability is derived from the capabilities
	 *                                           of the associated `$settings`.
	 *     @type callable $render_callback       Render callback.
	 *                                           Callback is called with one argument, the instance of WP_Customize_Partial.
	 *                                           The callback can either echo the partial or return the partial as a string,
	 *                                           or return false if error.
	 *     @type bool     $container_inclusive   Whether the container element is included in the partial, or if only
	 *                                           the contents are rendered.
	 *     @type bool     $fallback_refresh      Whether to refresh the entire preview in case a partial cannot be refreshed.
	 *                                           A partial render is considered a failure if the render_callback returns
	 *                                           false.
	 * }
	 */
	public function __construct( WP_Customize_Selective_Refresh $component, $id, $args = array() ) {
		$keys = array_keys( get_object_vars( $this ) );
		foreach ( $keys as $key ) {
			if ( isset( $args[ $key ] ) ) {
				$this->$key = $args[ $key ];
			}
		}

		$this->component       = $component;
		$this->id              = $id;