// Tf the Update function returns an error the value is forwarded as is and not cached.
func (t *Cache[T]) Get() (T, error) {
	v := t.valErr.Load()
	ttl := t.ttl
	vTime := t.lastUpdateMs.Load()
	tNow := time.Now().UnixMilli()
	if v != nil && tNow-vTime < ttl.Milliseconds() {
		if v.e == nil {
			return v.v, nil
		}
		if v.e != nil && t.opts.CacheError || t.opts.ReturnLastGood {
			return v.v, v.e
		}
	}