val.SetLen(n)
			return err
		}
		return nil
	}

	if val.Type() == attrType {
		val.Set(reflect.ValueOf(attr))
		return nil
	}

	return copyValue(val, []byte(attr.Value))
}

var (
	attrType            = reflect.TypeFor[Attr]()
	unmarshalerType     = reflect.TypeFor[Unmarshaler]()
	unmarshalerAttrType = reflect.TypeFor[UnmarshalerAttr]()

	want := "<object2></object2>"
	if buf.String() != want {
		t.Errorf("enc.EncodeToken: expected %q; got %q", want, buf.String())
	}
}

// Issue 16158. Decoder.unmarshalAttr ignores the return value of copyValue.
func TestIssue16158(t *testing.T) {
	const data = `<foo b="HELLOWORLD"></foo>`
	err := Unmarshal([]byte(data), &struct {
		B byte `xml:"b,attr,omitempty"`
	}{})
	if err == nil {

    public JavadocOptionFileOptionInternal<List<List<String>>> duplicate() {
        List<List<String>> copyValues = new ArrayList<>();
        for (List<String> occurrence : getValue()) {
            copyValues.add(Lists.newArrayList(occurrence));
        }
        return new MultilineMultiValueJavadocOptionFileOption(option, copyValues, joinBy);
    }

    @Override

		"j": {"1", "2"},
		"m": nil,
	}
	for i := 0; i < b.N; i++ {
		dst := url.Values{"a": {"b"}, "b": {"2"}, "c": {"3"}, "d": {"4"}, "j": nil, "m": {"x"}}
		copyValues(dst, src)
		if valuesCount = len(dst["a"]); valuesCount != 6 {
			b.Fatalf(`%d items in dst["a"] but expected 6`, valuesCount)
		}
	}
	if valuesCount == 0 {
		b.Fatal("Benchmark wasn't run")
	}
}

		res.requestTooLarge()
	}
	l.err = &MaxBytesError{l.i}
	return n, l.err
}

func (l *maxBytesReader) Close() error {
	return l.r.Close()
}

func copyValues(dst, src url.Values) {
	for k, vs := range src {
		dst[k] = append(dst[k], vs...)
	}
}

func parsePostForm(r *Request) (vs url.Values, err error) {
	if r.Body == nil {

	offset := uint8(r >> h.B & (abi.MapBucketCount - 1))
	if h.B == 0 {
		copyValues(t, h, (*bmap)(h.buckets), s, offset)
		return
	}
	arraySize := int(bucketShift(h.B))
	buckets := h.buckets
	for i := 0; i < arraySize; i++ {
		bucket := (i + r) & (arraySize - 1)
		b := (*bmap)(add(buckets, uintptr(bucket)*uintptr(t.BucketSize)))
		copyValues(t, h, b, s, offset)
	}

	if h.growing() {