docs: public void addModuleLayer(final Object moduleLayer) {
          if (!isModuleLayer(moduleLayer)) {
              throw new IllegalArgumentException("moduleLayer must be of type java.lang.ModuleLayer");
          }
          if (this.addedModuleLayers == null) {
              this.addedModuleLayers = new ArrayList<>();
          }
          this.addedModuleLayers.add(moduleLayer);
      }