2.3.1

• Socket.connect(to:) (synchronous) restores the socket's previous blocking mode on every path, including when the connect throws (#23).
• FileDescriptorRepresentable.set(flags:mask:) no longer ignores its flags argument, and setBlocking(_:)/isBlocking no longer invert O_NONBLOCK (#23). Code that relied on the two bugs cancelling (setBlocking(false)) still gets a non-blocking descriptor.

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