GoGoGoFast

> 请添加单元测试。请参阅`core/eval.go`。 expireat_test.go func TestEvalEXPIREAT(t *testing.T)

issue 283

I want to complete this task

I have a question, that is, after setting the expiration time, do I need to scan it regularly, or do I have to judge it when it is available? I...

Okok, that's good, that means that this function is perfect at present, right? Then I'll test it again