docs: public MarshallerRegistry merge(MarshallerRegistry.Builder marshallerRegistryOverrides) {
          if(marshallerRegistryOverrides == null) {
              return this;
          }
          Builder merged = MarshallerRegistry.builder();
          merged.copyMarshallersFromRegistry(this.marshallers);
          merged.copyMarshallersFromRegistry(marshallerRegistryOverrides.marshallers);
          return merged.build();
      }