// If v is the zero reflect.Value (v.Kind() == Invalid), DecodeValue discards the value.
// Otherwise, it stores the value into v. In that case, v must represent
// a non-nil pointer to data or be an assignable reflect.Value (v.CanSet())
// If the input is at EOF, DecodeValue returns [io.EOF] and
// does not modify v.
func (dec *Decoder) DecodeValue(v reflect.Value) error {
	if v.IsValid() {