Interdefined Bindata Records problem

description.txt

I want to create two records which refer to each other, but
Bindata seems to not want to let me do that.

The two solutions I came up with are to create a copy of one
record to another class with most the same functionality, or
to create an anonymous struct in one to copy most the functionality.
Both of these solutions require me to repeat myself, so I'd
like to create a more compact version like the first example.

Am I defining things wrong or does Bindata simply not allow
me to refer to Records that don't exist yet?  Can I force
Bindata to load the class definition ahead of time somehow?

inter_defined.rb

class Chunk < BinData::Record

  endian :little
  
  string :id, length: 4
  uint32 :chunk_size

  choice :data, selection: :id do
    riff_data "RIFF"
    array :default,
      type: :uint8,
      initial_length: -> {chunk_size.odd? ? chunk_size+1 : chunk_size}
  end
  
end

class RiffData < BinData::Record
  
  string :form_type, length: 4
  array :chunks, type: :chunk, read_until: :eof
  
end

solution1.rb

class Chunk < BinData::Record

  endian :little
  
  string :id, length: 4
  uint32 :chunk_size

  choice :data, selection: :id do
    riff_data "RIFF"
  end
  
end

class SubChunk < BinData::Record

  endian :little
  
  string :id, length: 4
  uint32 :chunk_size

  choice :data, selection: :id do
    array :default,
      type: :uint8,
      initial_length: -> {chunk_size.odd? ? chunk_size+1 : chunk_size}
  end

end

class RiffData < BinData::Record
  
  string :form_type, length: 4
  array :chunks, type: :sub_chunk, read_until: :eof
  
end

solution2.rb

class Chunk < BinData::Record

  endian :little
  
  string :id, length: 4
  uint32 :chunk_size

  choice :data, selection: :id do
    riff_data "RIFF"
    array :default,
      type: :uint8,
      initial_length: -> {chunk_size.odd? ? chunk_size+1 : chunk_size}
  end
  
end

class RiffData < BinData::Record
  
  string :form_type, length: 4
  array :chunks, read_until: :eof do
    endian :little
    
    string :id, length: 4
    uint32 :chunk_size
    choice :data, selection: :id do
      array :default,
        type: :uint8,
        initial_length: -> {chunk_size.odd? ? chunk_size+1 : chunk_size}
    end
  
  end
  
end