diff --git a/tape/dynamic.go b/tape/dynamic.go
index 67d1a88..e2b1b86 100644
--- a/tape/dynamic.go
+++ b/tape/dynamic.go
@@ -41,6 +41,7 @@ func EncodeAny(encoder *Encoder, value any, tag Tag) (n int, err error) {
 		}
 		nn, err := encoder.Write(value)
 		n += nn; if err != nil { return n, err }
+		return n, nil
 	}
 
 	// aggregates
@@ -184,7 +185,7 @@ func TagAny(value any) (Tag, error) {
 	// aggregates
 	reflectType := reflect.TypeOf(value)
 	switch reflectType.Kind() {
-	case reflect.Slice: return OTA.WithCN(reflect.ValueOf(value).Len() - 1), nil
+	case reflect.Slice: return OTA.WithCN(IntBytes(uint64(reflect.ValueOf(value).Len())) - 1), nil
 	case reflect.Array: return OTA.WithCN(reflectType.Len()), nil
 	case reflect.Map:
 		if reflectType.Key() == reflect.TypeOf(uint16(0)) {
@@ -203,7 +204,7 @@ func encodeAnySlice(encoder *Encoder, value any, tag Tag) (n int, err error) {
 	reflectType := reflect.TypeOf(value)
 	oneTag, err := TagAny(reflect.Zero(reflectType.Elem()).Interface())
 	if err != nil { return n, err }
-	for index := 0; index <= reflectValue.Len(); index += 1 {
+	for index := 0; index < reflectValue.Len(); index += 1 {
 		item := reflectValue.Index(index).Interface()
 		itemTag, err := TagAny(item)
 		if err != nil { return n, err }
@@ -212,7 +213,7 @@ func encodeAnySlice(encoder *Encoder, value any, tag Tag) (n int, err error) {
 	if oneTag.Is(SBA) { oneTag += 1 << 5 }
 	nn, err = encoder.WriteUint8(uint8(oneTag))
 	n += nn; if err != nil { return n, err }
-	for index := 0; index <= reflectValue.Len(); index += 1 {
+	for index := 0; index < reflectValue.Len(); index += 1 {
 		item := reflectValue.Index(index).Interface()
 		nn, err = EncodeAny(encoder, item, oneTag)
 		n += nn; if err != nil { return n, err }
@@ -232,7 +233,7 @@ func encodeAnyMap(encoder *Encoder, value any, tag Tag) (n int, err error) {
 		nn, err = encoder.WriteUint16(key)
 		n += nn; if err != nil { return n, err }
 		itemTag, err := TagAny(value)
-		n += nn; if err != nil { return n, err }
+		if err != nil { return n, err }
 		nn, err = encoder.WriteUint8(uint8(itemTag))
 		n += nn; if err != nil { return n, err }
 		nn, err = EncodeAny(encoder, value, itemTag)