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This change implicitly adds IPv6 support. If the address contains ":", we try to use a TCP socket instead of a Unix domain socket. Everything in front of the last occurrence of ":" is the hostname and everything after it the port. If the hostname lookup fails, we fall back to using a Unix domain socket. If the port is empty ("localhost:"), a random port will be assigned. Examples: NVIM_LISTEN_ADDRESS=localhost:12345 -> TCP (IPv4 or IPv6), port: 12345 NVIM_LISTEN_ADDRESS=localhost: -> TCP (IPv4 or IPv6), port: random (> 1024) NVIM_LISTEN_ADDRESS=localhost:0 -> TCP (IPv4 or IPv6), port: random (> 1024) NVIM_LISTEN_ADDRESS=localhost -> Unix domain socket "localhost" in current dir