type onlyValuesCtx struct {
	context.Context
	lookupValues context.Context
}

var _ context.Context = (*onlyValuesCtx)(nil)

// Value performs a lookup if the original context hasn't expired.
func (ovc *onlyValuesCtx) Value(key any) any {
	select {
	case <-ovc.lookupValues.Done():
		return nil
	default:
		return ovc.lookupValues.Value(key)
	}
}