internal/proto: ensure dynamic message key incremental

internal/proto/dynamic.go

@@ -5,7 +5,7 @@ import (
 	"math"
 )
 
-type DynamicMessage map[uint64]any
+type DynamicMessage []any
 
 // zigzag encoding types
 type (
@@ -22,7 +22,7 @@ func (msg DynamicMessage) Encode() []byte {
 	en := encoder{}
 	//nolint:staticcheck
 	for id, value := range msg {
-		key := id << 3
+		key := uint64(id << 3)
 		switch v := value.(type) {
 		case bool:
 			en.uvarint(key | 0)

internal/proto/dynamic_test.go

@@ -1,6 +1,7 @@
 package proto
 
 import (
+	"bytes"
 	"math"
 	"testing"
 )
@@ -44,3 +45,15 @@ func Benchmark_encoder_svarint(b *testing.B) {
 		benchEncoderSvarint(b, math.MaxInt64)
 	})
 }
+
+func TestDynamicMessage_Encode(t *testing.T) {
+	input := DynamicMessage{
+		1: 2,
+		3: 4,
+	}
+	got := input.Encode()
+	expected := []byte{1 << 3, 2, 3 << 3, 4}
+	if !bytes.Equal(got, expected) {
+		t.Fatalf("expected %v but got %v", expected, got)
+	}
+}