diff --git a/msgpack_reader.go b/msgpack_reader.go
index 13ce160..0461c87 100644
--- a/msgpack_reader.go
+++ b/msgpack_reader.go
@@ -1,6 +1,7 @@
 package meta
 
 import (
+	"bytes"
 	"io"
 
 	"github.com/pkg/errors"
@@ -9,148 +10,459 @@ import (
 )
 
 type msgpackReader struct {
-	dec        *msgpack.Decoder
-	containers []msgpackContainer
+	dec   *msgpack.Decoder
+	stack []readContainer
+	curr  readContainer
 }
 
-type msgpackContainer struct {
-	length int
-	assoc  bool
+type readContainer struct {
+	started bool
+	length  int
+	assoc   bool
+	values  map[string]msgpack.RawMessage
+	reader  io.Reader
+	readCnt int
 }
 
 func NewMsgpackReader(r io.Reader) Reader {
 	return &msgpackReader{
-		dec:        msgpack.NewDecoder(r),
-		containers: make([]msgpackContainer, 0, 2),
+		dec:   msgpack.NewDecoder(r),
+		stack: make([]readContainer, 0, 2),
+		curr: readContainer{
+			reader: r,
+		},
 	}
 }
 
-func (rd *msgpackReader) currentContainer() msgpackContainer {
-	if rd == nil || len(rd.containers) == 0 {
-		return msgpackContainer{}
-	}
-
-	return rd.containers[len(rd.containers)-1]
-}
-
-func (rd *msgpackReader) ReadInt8(v *int8, field string) error {
-	tmp, err := rd.dec.DecodeInt8()
+func (rd *msgpackReader) readField() (string, error) {
+	field, err := rd.dec.DecodeString()
 	if err != nil {
-		return errors.WithStack(err)
+		return "", errors.WithStack(err)
 	}
-	*v = tmp
-	return nil
+	return field, nil
 }
 
-func (rd *msgpackReader) ReadInt16(v *int16, field string) error {
-	tmp, err := rd.dec.DecodeInt16()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadInt8(v *int8, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeInt8(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeInt8(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeInt8(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadInt32(v *int32, field string) error {
-	tmp, err := rd.dec.DecodeInt32()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadInt16(v *int16, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeInt16(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeInt16(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeInt16(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadInt64(v *int64, field string) error {
-	tmp, err := rd.dec.DecodeInt64()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadInt32(v *int32, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeInt32(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeInt32(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeInt32(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadUint8(v *uint8, field string) error {
-	tmp, err := rd.dec.DecodeUint8()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadInt64(v *int64, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeInt64(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeInt64(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeInt64(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadUint16(v *uint16, field string) error {
-	tmp, err := rd.dec.DecodeUint16()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadUint8(v *uint8, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeUint8(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeUint8(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeUint8(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadUint32(v *uint32, field string) error {
-	tmp, err := rd.dec.DecodeUint32()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadUint16(v *uint16, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeUint16(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeUint16(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeUint16(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadUint64(v *uint64, field string) error {
-	tmp, err := rd.dec.DecodeUint64()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadUint32(v *uint32, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeUint32(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeUint32(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeUint32(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadBool(v *bool, field string) error {
-	tmp, err := rd.dec.DecodeBool()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadUint64(v *uint64, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeUint64(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeUint64(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeUint64(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadFloat32(v *float32, field string) error {
-	tmp, err := rd.dec.DecodeFloat32()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadBool(v *bool, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeBool(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeBool(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeBool(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadFloat64(v *float64, field string) error {
-	tmp, err := rd.dec.DecodeFloat64()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadFloat32(v *float32, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeFloat32(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeFloat32(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeFloat32(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadString(v *string, field string) error {
-	tmp, err := rd.dec.DecodeString()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadFloat64(v *float64, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeFloat64(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeFloat64(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeFloat64(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) ReadBytes(v *[]byte, field string) error {
-	tmp, err := rd.dec.DecodeBytes()
-	if err != nil {
-		return errors.WithStack(err)
+func (rd *msgpackReader) ReadString(v *string, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeString(rd.dec, v)
 	}
-	*v = tmp
-	return nil
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeString(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeString(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
 }
 
-func (rd *msgpackReader) BeginContainer(field string) error {
+func (rd *msgpackReader) ReadBytes(v *[]byte, targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return decodeBytes(rd.dec, v)
+	}
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		dec := msgpack.NewDecoder(bytes.NewReader(b))
+		return decodeBytes(dec, v)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return decodeBytes(rd.dec, v)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
+}
+
+func (rd *msgpackReader) BeginContainer(targetField string) error {
+	if !rd.curr.started || !rd.curr.assoc {
+		return rd.beginContainer(targetField)
+	}
+
+	if b, ok := rd.curr.values[targetField]; ok {
+		rd.dec.Reset(bytes.NewReader(b))
+		return rd.beginContainer(targetField)
+	}
+
+	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
+		field, err := rd.readField()
+		if err != nil {
+			return err
+		}
+		if field == targetField {
+			rd.curr.readCnt = i + 1
+			return rd.beginContainer(targetField)
+		}
+
+		raw, err := rd.dec.DecodeRaw()
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		rd.curr.values[field] = raw
+	}
+
+	return errors.Errorf("field `%s` not found", targetField)
+}
+
+func (rd *msgpackReader) beginContainer(field string) error {
 	code, err := rd.dec.PeekCode()
 	if err != nil {
 		return errors.WithStack(err)
@@ -162,20 +474,27 @@ func (rd *msgpackReader) BeginContainer(field string) error {
 		if err != nil {
 			return errors.WithStack(err)
 		}
-		rd.containers = append(rd.containers, msgpackContainer{
-			length: l,
-			assoc:  true,
-		})
+		rd.stack = append(rd.stack, rd.curr)
+		rd.curr = readContainer{
+			started: true,
+			length:  l,
+			assoc:   true,
+			values:  make(map[string]msgpack.RawMessage, l),
+			reader:  rd.dec.Buffered(),
+		}
 
 	case msgpcode.IsFixedArray(code), code == msgpcode.Array16, code == msgpcode.Array32:
 		l, err := rd.dec.DecodeArrayLen()
 		if err != nil {
 			return errors.WithStack(err)
 		}
-		rd.containers = append(rd.containers, msgpackContainer{
-			length: l,
-			assoc:  false,
-		})
+		rd.stack = append(rd.stack, rd.curr)
+		rd.curr = readContainer{
+			started: true,
+			length:  l,
+			assoc:   false,
+			reader:  rd.dec.Buffered(),
+		}
 
 	default:
 		return errors.Errorf("there is no container for field `%s`", field)
@@ -184,19 +503,21 @@ func (rd *msgpackReader) BeginContainer(field string) error {
 }
 
 func (rd *msgpackReader) EndContainer() error {
-	if len(rd.containers) == 0 {
+	if len(rd.stack) == 0 {
 		return errors.New("there is no open containers")
 	}
-	rd.containers = rd.containers[:len(rd.containers)-1]
+	rd.curr = rd.stack[len(rd.stack)-1]
+	rd.stack = rd.stack[:len(rd.stack)-1]
+	rd.dec.Reset(rd.curr.reader)
 	return nil
 }
 
 func (rd *msgpackReader) ContainerSize() (int, error) {
-	return rd.currentContainer().length, nil
+	return rd.curr.length, nil
 }
 
 func (rd *msgpackReader) IsContainerAssoc() (bool, error) {
-	return rd.currentContainer().assoc, nil
+	return rd.curr.assoc, nil
 }
 
 func (rd *msgpackReader) Skip() error {
@@ -233,3 +554,120 @@ func (rd *msgpackReader) TryReadMask() (bool, FieldsMask, error) {
 
 	return true, mask, nil
 }
+
+func decodeUint8(dec *msgpack.Decoder, v *uint8) error {
+	tmp, err := dec.DecodeUint8()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeUint16(dec *msgpack.Decoder, v *uint16) error {
+	tmp, err := dec.DecodeUint16()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeUint32(dec *msgpack.Decoder, v *uint32) error {
+	tmp, err := dec.DecodeUint32()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeUint64(dec *msgpack.Decoder, v *uint64) error {
+	tmp, err := dec.DecodeUint64()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeInt8(dec *msgpack.Decoder, v *int8) error {
+	tmp, err := dec.DecodeInt8()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeInt16(dec *msgpack.Decoder, v *int16) error {
+	tmp, err := dec.DecodeInt16()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeInt32(dec *msgpack.Decoder, v *int32) error {
+	tmp, err := dec.DecodeInt32()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeInt64(dec *msgpack.Decoder, v *int64) error {
+	tmp, err := dec.DecodeInt64()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeBool(dec *msgpack.Decoder, v *bool) error {
+	tmp, err := dec.DecodeBool()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeFloat32(dec *msgpack.Decoder, v *float32) error {
+	tmp, err := dec.DecodeFloat32()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeFloat64(dec *msgpack.Decoder, v *float64) error {
+	tmp, err := dec.DecodeFloat64()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeString(dec *msgpack.Decoder, v *string) error {
+	tmp, err := dec.DecodeString()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
+
+func decodeBytes(dec *msgpack.Decoder, v *[]byte) error {
+	tmp, err := dec.DecodeBytes()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*v = tmp
+	return nil
+}
diff --git a/msgpack_stateful_reader.go b/msgpack_stateful_reader.go
deleted file mode 100644
index 9dd5961..0000000
--- a/msgpack_stateful_reader.go
+++ /dev/null
@@ -1,672 +0,0 @@
-package meta
-
-import (
-	"bytes"
-	"io"
-
-	"github.com/pkg/errors"
-	"github.com/vmihailenco/msgpack/v5"
-	"github.com/vmihailenco/msgpack/v5/msgpcode"
-)
-
-type msgpackStatefulReader struct {
-	dec   *msgpack.Decoder
-	stack []container
-	curr  container
-}
-
-type container struct {
-	started bool
-	length  int
-	assoc   bool
-	values  map[string]msgpack.RawMessage
-	reader  io.Reader
-	readCnt int
-}
-
-func NewMsgpackStatefulReader(r io.Reader) Reader {
-	return &msgpackStatefulReader{
-		dec:   msgpack.NewDecoder(r),
-		stack: make([]container, 0, 2),
-		curr: container{
-			reader: r,
-		},
-	}
-}
-
-func (rd *msgpackStatefulReader) readField() (string, error) {
-	field, err := rd.dec.DecodeString()
-	if err != nil {
-		return "", errors.WithStack(err)
-	}
-	return field, nil
-}
-
-func (rd *msgpackStatefulReader) ReadInt8(v *int8, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeInt8(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeInt8(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeInt8(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadInt16(v *int16, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeInt16(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeInt16(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeInt16(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadInt32(v *int32, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeInt32(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeInt32(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeInt32(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadInt64(v *int64, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeInt64(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeInt64(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeInt64(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadUint8(v *uint8, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeUint8(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeUint8(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeUint8(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadUint16(v *uint16, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeUint16(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeUint16(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeUint16(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadUint32(v *uint32, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeUint32(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeUint32(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeUint32(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadUint64(v *uint64, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeUint64(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeUint64(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeUint64(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadBool(v *bool, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeBool(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeBool(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeBool(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadFloat32(v *float32, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeFloat32(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeFloat32(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeFloat32(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadFloat64(v *float64, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeFloat64(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeFloat64(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeFloat64(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadString(v *string, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeString(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeString(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeString(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) ReadBytes(v *[]byte, targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return decodeBytes(rd.dec, v)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		dec := msgpack.NewDecoder(bytes.NewReader(b))
-		return decodeBytes(dec, v)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return decodeBytes(rd.dec, v)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) BeginContainer(targetField string) error {
-	if !rd.curr.started || !rd.curr.assoc {
-		return rd.beginContainer(targetField)
-	}
-
-	if b, ok := rd.curr.values[targetField]; ok {
-		rd.dec.Reset(bytes.NewReader(b))
-		return rd.beginContainer(targetField)
-	}
-
-	for i := rd.curr.readCnt; i < rd.curr.length; i++ {
-		field, err := rd.readField()
-		if err != nil {
-			return err
-		}
-		if field == targetField {
-			rd.curr.readCnt = i + 1
-			return rd.beginContainer(targetField)
-		}
-
-		raw, err := rd.dec.DecodeRaw()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.curr.values[field] = raw
-	}
-
-	return errors.Errorf("field `%s` not found", targetField)
-}
-
-func (rd *msgpackStatefulReader) beginContainer(field string) error {
-	code, err := rd.dec.PeekCode()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-
-	switch {
-	case msgpcode.IsFixedMap(code), code == msgpcode.Map16, code == msgpcode.Map32:
-		l, err := rd.dec.DecodeMapLen()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.stack = append(rd.stack, rd.curr)
-		rd.curr = container{
-			started: true,
-			length:  l,
-			assoc:   true,
-			values:  make(map[string]msgpack.RawMessage, l),
-			reader:  rd.dec.Buffered(),
-		}
-
-	case msgpcode.IsFixedArray(code), code == msgpcode.Array16, code == msgpcode.Array32:
-		l, err := rd.dec.DecodeArrayLen()
-		if err != nil {
-			return errors.WithStack(err)
-		}
-		rd.stack = append(rd.stack, rd.curr)
-		rd.curr = container{
-			started: true,
-			length:  l,
-			assoc:   false,
-			reader:  rd.dec.Buffered(),
-		}
-
-	default:
-		return errors.Errorf("there is no container for field `%s`", field)
-	}
-	return nil
-}
-
-func (rd *msgpackStatefulReader) EndContainer() error {
-	if len(rd.stack) == 0 {
-		return errors.New("there is no open containers")
-	}
-	rd.curr = rd.stack[len(rd.stack)-1]
-	rd.stack = rd.stack[:len(rd.stack)-1]
-	return nil
-}
-
-func (rd *msgpackStatefulReader) ContainerSize() (int, error) {
-	return rd.curr.length, nil
-}
-
-func (rd *msgpackStatefulReader) IsContainerAssoc() (bool, error) {
-	return rd.curr.assoc, nil
-}
-
-func (rd *msgpackStatefulReader) Skip() error {
-	return errors.WithStack(rd.dec.Skip())
-}
-
-func (rd *msgpackStatefulReader) TryReadMask() (bool, FieldsMask, error) {
-	code, err := rd.dec.PeekCode()
-	if err != nil {
-		return false, FieldsMask{}, errors.WithStack(err)
-	}
-
-	if code != msgpcode.Nil {
-		return false, FieldsMask{}, nil
-	}
-
-	if err := rd.dec.Skip(); err != nil {
-		return false, FieldsMask{}, errors.WithStack(err)
-	}
-
-	var mask FieldsMask
-	maskLen, err := rd.dec.DecodeArrayLen()
-	if err != nil {
-		return false, FieldsMask{}, errors.WithStack(err)
-	}
-
-	for i := 0; i < maskLen; i++ {
-		maskPart, err := rd.dec.DecodeUint64()
-		if err != nil {
-			return false, FieldsMask{}, errors.WithStack(err)
-		}
-		mask.SetPartFromUint64(i, maskPart)
-	}
-
-	return true, mask, nil
-}
-
-func decodeUint8(dec *msgpack.Decoder, v *uint8) error {
-	tmp, err := dec.DecodeUint8()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeUint16(dec *msgpack.Decoder, v *uint16) error {
-	tmp, err := dec.DecodeUint16()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeUint32(dec *msgpack.Decoder, v *uint32) error {
-	tmp, err := dec.DecodeUint32()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeUint64(dec *msgpack.Decoder, v *uint64) error {
-	tmp, err := dec.DecodeUint64()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeInt8(dec *msgpack.Decoder, v *int8) error {
-	tmp, err := dec.DecodeInt8()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeInt16(dec *msgpack.Decoder, v *int16) error {
-	tmp, err := dec.DecodeInt16()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeInt32(dec *msgpack.Decoder, v *int32) error {
-	tmp, err := dec.DecodeInt32()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeInt64(dec *msgpack.Decoder, v *int64) error {
-	tmp, err := dec.DecodeInt64()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeBool(dec *msgpack.Decoder, v *bool) error {
-	tmp, err := dec.DecodeBool()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeFloat32(dec *msgpack.Decoder, v *float32) error {
-	tmp, err := dec.DecodeFloat32()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeFloat64(dec *msgpack.Decoder, v *float64) error {
-	tmp, err := dec.DecodeFloat64()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeString(dec *msgpack.Decoder, v *string) error {
-	tmp, err := dec.DecodeString()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
-
-func decodeBytes(dec *msgpack.Decoder, v *[]byte) error {
-	tmp, err := dec.DecodeBytes()
-	if err != nil {
-		return errors.WithStack(err)
-	}
-	*v = tmp
-	return nil
-}
diff --git a/msgpack_stateful_reader_test.go b/msgpack_stateful_reader_test.go
deleted file mode 100644
index 719ed94..0000000
--- a/msgpack_stateful_reader_test.go
+++ /dev/null
@@ -1,124 +0,0 @@
-package meta_test
-
-import (
-	"bytes"
-	"encoding/hex"
-	"testing"
-
-	"git.bit5.ru/backend/meta"
-	"github.com/stretchr/testify/require"
-)
-
-type foo struct {
-	field1 uint32
-	field2 uint32
-	field3 []uint32
-	field4 bar
-}
-
-func (f *foo) Read(reader meta.Reader) error {
-	if err := reader.BeginContainer(""); err != nil {
-		return err
-	}
-	if err := f.ReadFields(reader); err != nil {
-		return err
-	}
-	if err := reader.EndContainer(); err != nil {
-		return err
-	}
-	return nil
-}
-
-func (f *foo) ReadFields(reader meta.Reader) error {
-	if err := reader.ReadUint32(&f.field1, "f1"); err != nil {
-		return err
-	}
-
-	if err := reader.ReadUint32(&f.field2, "f2"); err != nil {
-		return err
-	}
-
-	if err := reader.BeginContainer("f3"); err != nil {
-		return err
-	}
-	size, err := reader.ContainerSize()
-	if err != nil {
-		return err
-	}
-	for ; size > 0; size-- {
-		var tmp uint32
-		if err := reader.ReadUint32(&tmp, ""); err != nil {
-			return err
-		}
-		f.field3 = append(f.field3, tmp)
-	}
-	if err := reader.EndContainer(); err != nil {
-		return err
-	}
-
-	if err := reader.BeginContainer("f4"); err != nil {
-		return err
-	}
-	if err := f.field4.ReadFields(reader); err != nil {
-		return err
-	}
-	if err := reader.EndContainer(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-type bar struct {
-	a uint32
-	b uint32
-}
-
-func (b *bar) Read(reader meta.Reader) error {
-	if err := reader.BeginContainer(""); err != nil {
-		return err
-	}
-	if err := b.ReadFields(reader); err != nil {
-		return err
-	}
-	if err := reader.EndContainer(); err != nil {
-		return err
-	}
-	return nil
-}
-
-func (b *bar) ReadFields(reader meta.Reader) error {
-	if err := reader.ReadUint32(&b.a, "a"); err != nil {
-		return err
-	}
-
-	if err := reader.ReadUint32(&b.b, "b"); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func TestMsgprdr(t *testing.T) {
-	str := `84A266310AA2663393010203A2663482A16104A16205A266320F`
-	b, err := hex.DecodeString(str)
-	require.NoError(t, err)
-
-	rdr := meta.NewMsgpackStatefulReader(bytes.NewReader(b))
-
-	var actual foo
-	readErr := actual.Read(rdr)
-	require.NoError(t, readErr)
-
-	expected := foo{
-		field1: 10,
-		field2: 15,
-		field3: []uint32{1, 2, 3},
-		field4: bar{
-			a: 4,
-			b: 5,
-		},
-	}
-
-	require.EqualValues(t, expected, actual)
-}
diff --git a/msgpack_writer.go b/msgpack_writer.go
index 90236d3..7c7adc7 100644
--- a/msgpack_writer.go
+++ b/msgpack_writer.go
@@ -9,19 +9,24 @@ import (
 
 type msgpackWriter struct {
 	enc        *msgpack.Encoder
-	containers []msgpackContainer
+	containers []writeContainer
+}
+
+type writeContainer struct {
+	length int
+	assoc  bool
 }
 
 func NewMsgpackWriter(w io.Writer) Writer {
 	return &msgpackWriter{
 		enc:        msgpack.NewEncoder(w),
-		containers: make([]msgpackContainer, 0, 1),
+		containers: make([]writeContainer, 0, 1),
 	}
 }
 
-func (wr *msgpackWriter) currentContainer() msgpackContainer {
+func (wr *msgpackWriter) currentContainer() writeContainer {
 	if wr == nil || len(wr.containers) == 0 {
-		return msgpackContainer{}
+		return writeContainer{}
 	}
 	return wr.containers[len(wr.containers)-1]
 }
@@ -132,7 +137,7 @@ func (wr *msgpackWriter) BeginContainer(length int, field string) error {
 	if err := wr.enc.EncodeArrayLen(length); err != nil {
 		return errors.WithStack(err)
 	}
-	wr.containers = append(wr.containers, msgpackContainer{
+	wr.containers = append(wr.containers, writeContainer{
 		length: length,
 		assoc:  false,
 	})
@@ -146,7 +151,7 @@ func (wr *msgpackWriter) BeginAssocContainer(length int, field string) error {
 	if err := wr.enc.EncodeMapLen(length); err != nil {
 		return errors.WithStack(err)
 	}
-	wr.containers = append(wr.containers, msgpackContainer{
+	wr.containers = append(wr.containers, writeContainer{
 		length: length,
 		assoc:  true,
 	})
diff --git a/structs_test.go b/structs_test.go
index 6af51f5..b02690b 100644
--- a/structs_test.go
+++ b/structs_test.go
@@ -2,7 +2,6 @@ package meta_test
 
 import (
 	"git.bit5.ru/backend/meta"
-	"github.com/pkg/errors"
 )
 
 type TestParent struct {
@@ -12,17 +11,6 @@ type TestParent struct {
 	Field4 []TestFoo `json:"f4" msgpack:"f4"`
 }
 
-var _TestParentRequiredFields map[string]struct{}
-
-func init() {
-	_TestParentRequiredFields = map[string]struct{}{
-		"f1": {},
-		"f2": {},
-		"f3": {},
-		"f4": {},
-	}
-}
-
 func (s *TestParent) Reset() {
 
 	s.Field1 = ""
@@ -53,98 +41,6 @@ func (s *TestParent) Read(reader meta.Reader) error {
 func (s *TestParent) ReadFields(reader meta.Reader) error {
 	s.Reset()
 
-	readAsMap, err := reader.IsContainerAssoc()
-	if err != nil {
-		return err
-	}
-	if readAsMap {
-		return s.readFieldsAssociative(reader)
-	}
-	return s.readFields(reader)
-}
-
-func (s *TestParent) readFieldsAssociative(reader meta.Reader) error {
-	size, err := reader.ContainerSize()
-	if err != nil {
-		return err
-	}
-
-	readFields := make(map[string]struct{}, 4)
-	for ; size > 0; size-- {
-		var field string
-		if err := reader.ReadString(&field, ""); err != nil {
-			return err
-		}
-
-		switch field {
-		case "f1":
-			if err := reader.ReadString(&s.Field1, "f1"); err != nil {
-				return err
-			}
-
-		case "f2":
-			if err := s.Field2.Read(reader); err != nil {
-				return err
-			}
-
-		case "f3":
-			if err := reader.BeginContainer("f3"); err != nil {
-				return err
-			}
-			field3Size, err := reader.ContainerSize()
-			if err != nil {
-				return err
-			}
-			for ; field3Size > 0; field3Size-- {
-				var tmpField3 int8
-				if err := reader.ReadInt8(&tmpField3, ""); err != nil {
-					return err
-				}
-
-				s.Field3 = append(s.Field3, tmpField3)
-			}
-			if err := reader.EndContainer(); err != nil {
-				return err
-			}
-
-		case "f4":
-			if err := reader.BeginContainer("f4"); err != nil {
-				return err
-			}
-			field4Size, err := reader.ContainerSize()
-			if err != nil {
-				return err
-			}
-			for ; field4Size > 0; field4Size-- {
-				var tmpField4 TestFoo
-				if err := tmpField4.Read(reader); err != nil {
-					return err
-				}
-
-				s.Field4 = append(s.Field4, tmpField4)
-			}
-			if err := reader.EndContainer(); err != nil {
-				return err
-			}
-
-		default:
-			return errors.Errorf("unexpected field `%s`", field)
-		}
-
-		readFields[field] = struct{}{}
-	}
-
-	for field := range _TestParentRequiredFields {
-		if _, ok := readFields[field]; !ok {
-			return errors.Errorf("field `%s` is not present", field)
-		}
-	}
-
-	return nil
-}
-
-func (s *TestParent) readFields(reader meta.Reader) error {
-
 	contSize, err := reader.ContainerSize()
 	if err != nil {
 		return err
@@ -168,7 +64,13 @@ func (s *TestParent) readFields(reader meta.Reader) error {
 	}
 
 	contSize--
-	if err := s.Field2.Read(reader); err != nil {
+	if err := reader.BeginContainer("f2"); err != nil {
+		return err
+	}
+	if err := s.Field2.ReadFields(reader); err != nil {
+		return err
+	}
+	if err := reader.EndContainer(); err != nil {
 		return err
 	}
 
@@ -210,7 +112,13 @@ func (s *TestParent) readFields(reader meta.Reader) error {
 	}
 	for ; field4Size > 0; field4Size-- {
 		var tmpField4 TestFoo
-		if err := tmpField4.Read(reader); err != nil {
+		if err := reader.BeginContainer(""); err != nil {
+			return err
+		}
+		if err := tmpField4.ReadFields(reader); err != nil {
+			return err
+		}
+		if err := reader.EndContainer(); err != nil {
 			return err
 		}
 
@@ -290,14 +198,6 @@ type TestChild struct {
 	Field string `json:"f" msgpack:"f"`
 }
 
-var _TestChildRequiredFields map[string]struct{}
-
-func init() {
-	_TestChildRequiredFields = map[string]struct{}{
-		"f": {},
-	}
-}
-
 func (s *TestChild) Reset() {
 	s.TestParent.Reset()
 
@@ -318,103 +218,6 @@ func (s *TestChild) Read(reader meta.Reader) error {
 func (s *TestChild) ReadFields(reader meta.Reader) error {
 	s.Reset()
 
-	readAsMap, err := reader.IsContainerAssoc()
-	if err != nil {
-		return err
-	}
-	if readAsMap {
-		return s.readFieldsAssociative(reader)
-	}
-	return s.readFields(reader)
-}
-
-func (s *TestChild) readFieldsAssociative(reader meta.Reader) error {
-	size, err := reader.ContainerSize()
-	if err != nil {
-		return err
-	}
-
-	readFields := make(map[string]struct{}, 5)
-	for ; size > 0; size-- {
-		var field string
-		if err := reader.ReadString(&field, ""); err != nil {
-			return err
-		}
-
-		switch field {
-		case "f1":
-			if err := reader.ReadString(&s.Field1, "f1"); err != nil {
-				return err
-			}
-
-		case "f2":
-			if err := s.Field2.Read(reader); err != nil {
-				return err
-			}
-
-		case "f3":
-			if err := reader.BeginContainer("f3"); err != nil {
-				return err
-			}
-			field3Size, err := reader.ContainerSize()
-			if err != nil {
-				return err
-			}
-			for ; field3Size > 0; field3Size-- {
-				var tmpField3 int8
-				if err := reader.ReadInt8(&tmpField3, ""); err != nil {
-					return err
-				}
-
-				s.Field3 = append(s.Field3, tmpField3)
-			}
-			if err := reader.EndContainer(); err != nil {
-				return err
-			}
-
-		case "f4":
-			if err := reader.BeginContainer("f4"); err != nil {
-				return err
-			}
-			field4Size, err := reader.ContainerSize()
-			if err != nil {
-				return err
-			}
-			for ; field4Size > 0; field4Size-- {
-				var tmpField4 TestFoo
-				if err := tmpField4.Read(reader); err != nil {
-					return err
-				}
-
-				s.Field4 = append(s.Field4, tmpField4)
-			}
-			if err := reader.EndContainer(); err != nil {
-				return err
-			}
-
-		case "f":
-			if err := reader.ReadString(&s.Field, "f"); err != nil {
-				return err
-			}
-
-		default:
-			return errors.Errorf("unexpected field `%s`", field)
-		}
-
-		readFields[field] = struct{}{}
-	}
-
-	for field := range _TestChildRequiredFields {
-		if _, ok := readFields[field]; !ok {
-			return errors.Errorf("field `%s` is not present", field)
-		}
-	}
-
-	return nil
-}
-
-func (s *TestChild) readFields(reader meta.Reader) error {
-
 	contSize, err := reader.ContainerSize()
 	if err != nil {
 		return err
@@ -466,14 +269,6 @@ type TestFoo struct {
 	Field int64 `json:"field" msgpack:"field"`
 }
 
-var _TestFooRequiredFields map[string]struct{}
-
-func init() {
-	_TestFooRequiredFields = map[string]struct{}{
-		"field": {},
-	}
-}
-
 func (s *TestFoo) Reset() {
 
 	s.Field = 0
@@ -493,53 +288,6 @@ func (s *TestFoo) Read(reader meta.Reader) error {
 func (s *TestFoo) ReadFields(reader meta.Reader) error {
 	s.Reset()
 
-	readAsMap, err := reader.IsContainerAssoc()
-	if err != nil {
-		return err
-	}
-	if readAsMap {
-		return s.readFieldsAssociative(reader)
-	}
-	return s.readFields(reader)
-}
-
-func (s *TestFoo) readFieldsAssociative(reader meta.Reader) error {
-	size, err := reader.ContainerSize()
-	if err != nil {
-		return err
-	}
-
-	readFields := make(map[string]struct{}, 1)
-	for ; size > 0; size-- {
-		var field string
-		if err := reader.ReadString(&field, ""); err != nil {
-			return err
-		}
-
-		switch field {
-		case "field":
-			if err := reader.ReadInt64(&s.Field, "field"); err != nil {
-				return err
-			}
-
-		default:
-			return errors.Errorf("unexpected field `%s`", field)
-		}
-
-		readFields[field] = struct{}{}
-	}
-
-	for field := range _TestFooRequiredFields {
-		if _, ok := readFields[field]; !ok {
-			return errors.Errorf("field `%s` is not present", field)
-		}
-	}
-
-	return nil
-}
-
-func (s *TestFoo) readFields(reader meta.Reader) error {
-
 	contSize, err := reader.ContainerSize()
 	if err != nil {
 		return err