0.29:
  save 8 bytes in taia.h for 64-bit systems
  add buffer_tosa (buffer writing to auto-growing stralloc)
  add iarray
  support SCTP in addition to TCP
  fix io_receivefd so the incoming buffer is only 1 byte; io_passfd
    sends only one byte, so we might receive (and discard) other data if
    we try to read more (Stefan Bühler, from the lightttpd project)
  add io_fd_canwrite (like io_fd but assume the fd is writable)
  save a few syscalls here and there
  add awesome hack in isset.h (comex, Linus Torvalds)
  add byte_equal_notimingattack