http://7fh6tueqddpjyxjmgtdiueylzoqt6pt7hec3pukyptlmohoowvhde4yd.onion/public-inbox.git/tree/Documentation/technical/ds.txt
* IO::Socket::SSL support (for NNTPS, STARTTLS+NNTP, HTTPS)
* awaitpid (waitpid wrapper) support for reaping dead children
* reliable signal wakeups are supported via signalfd on Linux,
EVFILT_SIGNAL on *BSDs via IO::KQueue.
Removed features
* Many fields removed or moved to subclasses, so the underlying
hash is smaller and suitable for FDs other than stream sockets.