docs: public Object getConstantInitializerValue() {
          if (!scanResult.scanSpec.enableStaticFinalFieldConstantInitializerValues) {
              throw new IllegalArgumentException(
                      "Please call ClassGraph#enableStaticFinalFieldConstantInitializerValues() " + "before #scan()");
          }
          return constantInitializerValue == null ? null : constantInitializerValue.get();
      }