diff --git a/go/serializers/ugorji.go b/go/serializers/ugorji.go
index 133dd0fb..e83e0709 100644
--- a/go/serializers/ugorji.go
+++ b/go/serializers/ugorji.go
@@ -11,51 +11,50 @@ import (
 // ugorjiHandle is shared machinery for ugorji/go/codec handles.
 // Recommended (go-codec primer): reuse Handle; NewEncoderBytes + ResetBytes per encode;
 // NewDecoderBytes + ResetBytes per decode; WriterBufferSize for stream throughput.
+//
+// lib implementation doesn't allow a reset across bytes vs io, so keep 2 separate pairs
+//
 // https://github.com/ugorji/go/codec  http://ugorji.net/blog/go-codec-primer
 type ugorjiCodec struct {
 	name   string
 	h      codec.Handle
-	out    []byte
+	out    []byte	
 	enc    *codec.Encoder
 	dec    *codec.Decoder
+	strenc *codec.Encoder
+	strdec *codec.Decoder
 	proto  any
 }
 
-func configureBasic(h *codec.BasicHandle) {
+func newUgorjiCodec(h codec.Handle, bh *codec.BasicHandle) *ugorjiCodec {
 	// Buffering improves stream encode; zero Indent for JSON throughput.
-	h.WriterBufferSize = 8192
-	h.ReaderBufferSize = 8192
+	bh.WriterBufferSize = 8192
+	bh.ReaderBufferSize = 8192
+	s := &ugorjiCodec{name: "ugorji/"+h.Name(), h: h}
+	s.enc = codec.NewEncoderBytes(&s.out, h)
+	s.dec = codec.NewDecoderBytes(nil, h)
+	s.strenc = codec.NewEncoder(nil, h)
+	s.strdec = codec.NewDecoder(nil, h)
+	return s
 }
 
 func newUgorjiJSON() *ugorjiCodec {
-	jh := new(codec.JsonHandle)
-	configureBasic(&jh.BasicHandle)
+	h := new(codec.JsonHandle)
 	// Match high-throughput JSON: no HTML escape, no indent.
-	jh.HTMLCharsAsIs = true
-	jh.Indent = 0
-	s := &ugorjiCodec{name: "ugorji/json", h: jh}
-	s.enc = codec.NewEncoderBytes(&s.out, jh)
-	s.dec = codec.NewDecoderBytes(nil, jh)
-	return s
+	h.HTMLCharsAsIs = true
+	h.Indent = 0
+	return newUgorjiCodec(h, &h.BasicHandle)
 }
 
 func newUgorjiMsgpack() *ugorjiCodec {
-	mh := new(codec.MsgpackHandle)
-	configureBasic(&mh.BasicHandle)
+	h := new(codec.MsgpackHandle)
 	// WriteExt improves type fidelity for time etc.; keep default for structs.
-	s := &ugorjiCodec{name: "ugorji/msgpack", h: mh}
-	s.enc = codec.NewEncoderBytes(&s.out, mh)
-	s.dec = codec.NewDecoderBytes(nil, mh)
-	return s
+	return newUgorjiCodec(h, &h.BasicHandle)
 }
 
 func newUgorjiCBOR() *ugorjiCodec {
-	ch := new(codec.CborHandle)
-	configureBasic(&ch.BasicHandle)
-	s := &ugorjiCodec{name: "ugorji/cbor", h: ch}
-	s.enc = codec.NewEncoderBytes(&s.out, ch)
-	s.dec = codec.NewDecoderBytes(nil, ch)
-	return s
+	h := new(codec.CborHandle)
+	return newUgorjiCodec(h, &h.BasicHandle)
 }
 
 func (s *ugorjiCodec) Name() string           { return s.name }
@@ -66,8 +65,6 @@ func (s *ugorjiCodec) Supports(n string) bool { return DefaultSupports(n) }
 
 func (s *ugorjiCodec) Prepare(fx model.Fixture) error {
 	s.proto = fx.Value
-	s.out = s.out[:0]
-	s.enc.ResetBytes(&s.out)
 	return nil
 }
 
@@ -77,9 +74,7 @@ func (s *ugorjiCodec) SerializeBytes(fx model.Fixture) ([]byte, error) {
 	if err := s.enc.Encode(fx.Value); err != nil {
 		return nil, err
 	}
-	out := make([]byte, len(s.out))
-	copy(out, s.out)
-	return out, nil
+	return s.out, nil // honors zero-copy disciplined implementation
 }
 
 func (s *ugorjiCodec) DeserializeBytes(buf []byte) (any, error) {
@@ -93,9 +88,8 @@ func (s *ugorjiCodec) DeserializeBytes(buf []byte) (any, error) {
 
 func (s *ugorjiCodec) SerializeStream(fx model.Fixture, w io.Writer) (int, error) {
 	cw := &countWriter{w: w}
-	// Writer path: NewEncoder + Reset (cannot mix Bytes encoder with Writer Reset).
-	enc := codec.NewEncoder(cw, s.h)
-	if err := enc.Encode(fx.Value); err != nil {
+	s.strenc.Reset(cw)
+	if err := s.strenc.Encode(fx.Value); err != nil {
 		return 0, err
 	}
 	return cw.n, nil
@@ -103,8 +97,8 @@ func (s *ugorjiCodec) SerializeStream(fx model.Fixture, w io.Writer) (int, error
 
 func (s *ugorjiCodec) DeserializeStream(r io.Reader) (any, error) {
 	dst := model.NewEmptyPtr(s.proto)
-	dec := codec.NewDecoder(r, s.h)
-	if err := dec.Decode(dst); err != nil {
+	s.strdec.Reset(r)
+	if err := s.strdec.Decode(dst); err != nil {
 		return nil, err
 	}
 	return model.Deref(dst), nil