if err != nil {
		if t.opts.ReturnLastGood {
			// Keep last good value.
			v := t.valErr.Load()
			if v != nil {
				val = v.v
			}
		}
	}
	t.valErr.Store(&struct {
		v T
		e error
	}{v: val, e: err})
	t.lastUpdateMs.Store(time.Now().UnixMilli())

}

// Config represents the subnet related configuration
type Config struct {
	// Flag indicating whether cache is enabled.
	Enable bool `json:"enable"`

	// Endpoint for caching uses remote mcache server to
	// store and retrieve pre-condition check entities such as
	// Etag and ModTime of an object + version
	Endpoint string `json:"endpoint"`

	// BlockSize indicates the maximum object size below which