Merge branch 'master' into fly

wangpengfei

2023-07-21 357fa7bd92da576786fac0f5754cd75900d79bf7

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package constvar
 
import (
    "github.com/songzhibin97/gkit/cache/local_cache"
    "golang.org/x/sync/singleflight"
)
 
var (
    BlackCache  local_cache.Cache
    SingleGroup = &singleflight.Group{}
)