timeout in config file is not used

[hotpxl]

In the config file there is

# Close the connection after a client is idle for N seconds (0 to disable)
timeout 0

but I don't seem to find anywhere that references this value. Especially in db.cpp:~Ardb::ScanClients, it's using GetConf().tcp_keepalive to kick out idle clients instead of timeout. Is this configuration not used?