int plugin_notification_meta_add_double(notification_t *n, const char *name,
double value);
int plugin_notification_meta_add_boolean(notification_t *n, const char *name,
int plugin_notification_meta_add_double(notification_t *n, const char *name,
double value);
int plugin_notification_meta_add_boolean(notification_t *n, const char *name,