Add support for File/IO objects to migrate_simple_value

[postmodern]

It should be possible to pass a TCPSocket to a new Thread:

loop do
  Thread.new(@server.accept) do |client|
    client.puts "hello"
    client.close
  end
end

[mattn]

The TCPSocket you are talking is https://github.com/iij/mruby-io ?

[postmodern]

@mattn TCPSocket is actually defined in https://github.com/iij/mruby-socket, which depends on mruby-io.