src/main/java/org/nutz/ssdb4j/impl/SimpleClient.java
public Response setnx(Object key, Object val) {
		return req(Cmd.setnx, bytes(key), bytes(val));
	}
public Response setnx(Object key, Object val) {
		return req(Cmd.setnx, bytes(key), bytes(val));
	}
------------------------------------------