Member natsConnection_GetLastError (natsConnection *nc, const char **lastError): Returns an internal pointer, with potential for race conditions. Please use natsConnection_ReadLastError instead.
Member natsSubscription_NoDeliveryDelay (natsSubscription *sub): No longer needed. Will be removed in the future.
Member natsSubscription_QueuedMsgs (natsSubscription *sub, uint64_t *queuedMsgs): Use natsSubscription_GetPending instead.