segv.rb

require 'msgpack'

class MyObj
  def initialize(sec=nil, nsec=nil)
    t = Time.now
    @sec = sec || t.sec
    @nsec = nsec || t.nsec
  end

  def to_msgpack(io = nil)
    @sec.to_msgpack(io)
  end

  def to_msgpack_ext
    [@sec, @nsec].pack('NN')
  end

  def self.from_msgpack_ext(data)
    new(*data.unpack('NN'))
  end
end

factory = MessagePack::Factory.new
factory.register_type(0x01, MyObj)

obj = MyObj.new

packer = factory.packer

p 123.to_msgpack(packer)

# p packer.write(obj).to_s

# hash = {"tag" => "test", "obj" => obj}

# p packer.write(hash).to_s