Use strict maybe types in TCPIP library
There are two versions of a non-blocking TCP interface used in ObjectIO. One is in TCPIP/ObjectIO, the other in ObjectIO/Tcp. It is not clear to me which is newer. I have adapted the one in TCPIP/ObjectIO, so that compilation succeeds, but have not tested it because I could not find an example using it. (It is also not included in any distribution.) I have not touched ObjectIO/Tcp, since it is broken (
seq undefined). I will open a separate issue to see what to do with these modules.