Why need to check type of input data

[deverlex]

if (inputData != null) {
      for (final entry in inputData.entries) {
        final key = entry.key;
        final value = entry.value;
        if (!(value is int ||
            value is bool ||
            value is double ||
            value is String ||
            value is List<int> ||
            value is List<bool> ||
            value is List<double> ||
            value is List<String>)) {
          throw Exception(
              "argument $key has wrong type. WorkManager supports only int, bool, double, String and their list");
        }
      }
    }

I want to send dynamic object to inputData. It has an error because you check datatype of input data