module SafeYAML::Transform::TransformationMap::ClassMethods

def set_predefined_values(predefined_values)
  if SafeYAML::YAML_ENGINE == "syck"
    expanded_map = predefined_values.inject({}) do |hash, (key, value)|
      hash[key] = value
      hash[key.capitalize] = value
      hash[key.upcase] = value
      hash
    end
  else
    expanded_map = CaseAgnosticMap.new
    expanded_map.merge!(predefined_values)
  end
  self.const_set(:PREDEFINED_VALUES, expanded_map.freeze)
end