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* tcp: Set IPV6_V6ONLY for IPv6 listeners. The current behaviour of listening on an IPv6 address varies depending on the operating system's IP address stack implementation. Some support IPv4-mapped IPv6 addresses (e.g. Linux and newer versions of Windows) so a single IPv6 address would support IPv4-mapped addresses too. Others do not (e.g. OpenBSD). If they do, then some support them by default (e.g. Linux) and some do not (e.g. Windows). This PR attempts to implement the same behaviour accross operating systems. The strategy is as follows: Disable IPv4-mapped IPv6 addresses, hence the socket option IPV6_V6ONLY is always set to true. This allows binding two sockets to the same port and also avoids the problem of comparing mixed addresses which leads issues such as #1552. * Update CHANGELOG and address review concerns. * Update CHANGELOG.md Co-Authored-By: Pierre Krieger <pierre.krieger1708@gmail.com> Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>