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The `Socket` abstraction was refactored to only comprise of methods that can be generically used/applied to all socket domains and protocols. A more comprehensive IPv4/IPv6 module derived from @LemonBoy's earlier work was implemented under `std.x.os.IPv4` and `std.x.os.IPv6`. Using this module, one can then combine them together into a union for example in order to optimize memory usage when dealing with socket addresses. A `TCP.Client` and `TCP.Listener` abstraction is introduced that is one layer over the `Socket` abstraction, which isolates methods that can only be applied to a "client socket" and a "listening socket". All prior tests from the `Socket` abstraction, which all previously operated assuming the socket is operating via. TCP/IP, were moved. All TCP socket options were also moved into the `TCP.Client` and `TCP.Listener` abstractions respectively away from the `Socket` abstraction. Some additional socket options from @LemonBoy's prior PR for Darwin were also moved in (i.e. SIGNOPIPE).