def to_hash
      _new_hash= {}
      each do |key, value|
        _new_hash[convert_key(key)] = convert_value(value, for: :to_hash)
      end
      Hash.new(default).merge!(_new_hash)
    end
def to_hash
      _new_hash= {}
      each do |key, value|
        _new_hash[convert_key(key)] = convert_value(value, for: :to_hash)
      end
      Hash.new(default).merge!(_new_hash)
    end
Convert to a regular hash with string keys.