@UnstableApi
    public GrpcServiceBuilder useMethodMarshaller(boolean useMethodMarshaller) {
        if (unsafeWrapRequestBuffers && useMethodMarshaller) {
            throw new IllegalStateException(
                    "'unsafeWrapRequestBuffers' and 'useMethodMarshaller' are mutually exclusive."
            );
        }
        this.useMethodMarshaller = useMethodMarshaller;
        return this;
    }
Sets whether to respect the marshaller specified in gRPC {@link MethodDescriptor}
If not set, will use the default(false), which use more efficient way that reduce copy operation.
grpc/src/main/java/com/linecorp/armeria/server/grpc/GrpcServiceBuilder.java