- `fd_set` API is now much nicer and will compile about as close to the C implementation as we can get— especially on release builds, with compiler inlining.
- Socket structure's `readBuffer` now initializes all its bytes to zero, not just the first.
- More idiomatic/concise return expression in `Socket.wait(for:timeout:waitForever:)` (don't build an output array manually, we have `filter(_:)` for that).
- Various non-Linux code to set the `SO_NOSIGPIPE` option has been tucked into a private function now, still containing the compilation conditional. It's a no-op on Linux, and will be inlined by the compiler (since it's private) and the calling code looks much more straightforward.
- BUGFIX: calls to `gai_strerror(_:)` take the result of the `getaddrinfo()` call as a parameter, NOT `errno`.
Jim Dovey
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