code: private ShadowInfo checkShadowPickers(String instrumentedClassName, Class<?> clazz) {
      String shadowPickerClassName = shadowPickers.get(instrumentedClassName);
      if (shadowPickerClassName == null) {
        return null;
      }
  
      return pickShadow(instrumentedClassName, clazz, shadowPickerClassName);
    }
docs: todo: some caching would probably be nice here...