docs: private ClassDescriptor getNullnessAnnotationClassDescriptor(NullnessAnnotation n) {
          if (n == NullnessAnnotation.CHECK_FOR_NULL) {
              return JSR305NullnessAnnotations.CHECK_FOR_NULL;
          } else if (n == NullnessAnnotation.NONNULL) {
              return JSR305NullnessAnnotations.NONNULL;
          } else if (n == NullnessAnnotation.NULLABLE) {
              return JSR305NullnessAnnotations.NULLABLE;
          } else if (n == NullnessAnnotation.UNKNOWN_NULLNESS) {
              return JSR305NullnessAnnotations.NULLABLE;
          } else {
              throw new IllegalArgumentException("Unknown NullnessAnnotation: " + n);
          }
      }