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: helper.rb
    path of file: ./repos/tinymce-rails/lib/tinymce/rails
    
    the code of the file until where you have to start completion: require 'active_support/core_ext/hash/keys'

module TinyMCE::Rails
  module Helper
    # Initializes TinyMCE on the current page based on the global configuration.
    #
    # Custom options can be set via the
    
    def tinymce_configuration(config=:default, options={})
      options, config = config, :default if config.is_a?(Hash)
      options.stringify_keys!

      base_configuration = TinyMCE::Rails.configuration

      if base_configuration.is_a?(MultipleConfiguration)
        base_configuration = base_configuration.fetch(config)
      end