You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: micro_case.rb
    path of file: ./repos/todo-bcdd/config/initializers
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

Micro::Case.config do |config|
  # Use ActiveModel to auto-validate your use cases' attributes.
  config.enable_a
    
  def then_expose(*keys)
    return self if failure?

    raise ArgumentError, 'wrong number of arguments (expected at least 1)' if keys.empty?

    type, keys_to_expose =
      keys.size == 1 && keys[0].is_a?(::Hash) ? keys[0].to_a[0] : [:data_exposed, keys]

    available_data = @__accessible_attributes.merge(@__accumulated_data)

    data_to_expose = keys_to_expose.zip(available_data.fetch_values(*keys_to_expose)).to_h

    __set__(true, data_to_expose, type, use_case)
  end