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I added support for UNIX domain sockets to jsonrpclib, for both clients and servers. You can look at the test case I added to see how it works; the client recognizes a URL of the form "unix:/tmp/jsonrpclib.sock", and the server takes an address_family parameter that can be set to AF_UNIX.
UNIX sockets have improved performance and security properties; the latter is why I needed a JSON-RPC implementation over UNIX sockets.