# File lib/active_support/core_ext/big_decimal/conversions.rb, line 20
  def to_yaml(opts = {})
    return super if defined?(YAML::ENGINE) && !YAML::ENGINE.syck?

    YAML.quick_emit(nil, opts) do |out|
      string = to_s
      out.scalar(YAML_TAG, YAML_MAPPING[string] || string, :plain)
    end
  end