Gio.Settings.prototype.get_value
function get_value(key: String): GLib.Variant {
    // Gjs wrapper for g_settings_get_value()
}
  Gets the value that is stored in settings for key.
It is a programmer error to give a key that isn't contained in the schema for settings.
Since 2.26
- key
 the key to get the value for
- Returns
 a new GLib.Variant