double? parseIntOrDoubleAsDouble(dynamic value) {
  if (value == null) return null;
  if (value is double) return value;
  if (value is int) return value * 1.0;
  return null;
}

List<double> parseAsDoubleList(List<dynamic> inputList) {
  if (inputList.isEmpty) return const [];

  if (inputList is List<double>) return inputList;
  return List<double>.generate(
    inputList.length,
    (index) {
      final value = inputList[index];
      if (value is int) return value.toDouble();
      if (value is double) return value;
      throw FormatException(
        'Invalid type at index $index: ${value.runtimeType}',
      );
    },
    growable: false,
  );
}