diff --git a/encode.go b/encode.go
index 86cda18..700bebb 100644
--- a/encode.go
+++ b/encode.go
@@ -106,7 +106,7 @@ func (e *encoder) writeEmptyBlock(name string) (err error) {
 	return e.writeByte('\n')
 }
 
-func (e *encoder) writeMergedBlock(name string, vals []interface{}, path string) (err error) {
+func (e *encoder) writeMergedBlock(name string, vals []any, path string) (err error) {
 	if err = e.writeIndent(); err != nil {
 		return err
 	}
diff --git a/merge.go b/merge.go
index a5b011a..087c240 100644
--- a/merge.go
+++ b/merge.go
@@ -10,7 +10,7 @@ import (
 )
 
 //nolint:unused
-func mergeValues(a, b interface{}) (interface{}, error) {
+func mergeValues(a, b any) (any, error) {
 	if a == nil && b == nil {
 		return nil, nil
 	}
@@ -55,10 +55,10 @@ func mergeValues(a, b interface{}) (interface{}, error) {
 
 	// Если типы не совпадают (и не обе структуры) -> список
 	if baseA.Type() != baseB.Type() {
-		return []interface{}{a, b}, nil
+		return []any{a, b}, nil
 	}
 
-	var result interface{}
+	var result any
 	var err error
 	switch baseA.Kind() {
 	case reflect.Struct:
@@ -96,7 +96,7 @@ func derefValue(v reflect.Value) reflect.Value {
 }
 
 //nolint:unused
-func mergeStruct(va, vb reflect.Value) (interface{}, error) {
+func mergeStruct(va, vb reflect.Value) (any, error) {
 	t := va.Type()
 	result := reflect.New(t).Elem()
 	result.Set(va)
@@ -124,7 +124,7 @@ func mergeStruct(va, vb reflect.Value) (interface{}, error) {
 }
 
 //nolint:unused
-func mergeMap(va, vb reflect.Value) (interface{}, error) {
+func mergeMap(va, vb reflect.Value) (any, error) {
 	t := va.Type()
 	result := reflect.MakeMap(t)
 
@@ -151,7 +151,7 @@ func mergeMap(va, vb reflect.Value) (interface{}, error) {
 }
 
 //nolint:unused,unparam
-func mergeSlice(va, vb reflect.Value) (interface{}, error) {
+func mergeSlice(va, vb reflect.Value) (any, error) {
 	totalLen := va.Len() + vb.Len()
 	result := reflect.MakeSlice(va.Type(), totalLen, totalLen)
 	reflect.Copy(result, va)
@@ -160,7 +160,7 @@ func mergeSlice(va, vb reflect.Value) (interface{}, error) {
 }
 
 //nolint:unused
-func mergeArray(va, vb reflect.Value) (interface{}, error) {
+func mergeArray(va, vb reflect.Value) (any, error) {
 	if va.Len() != vb.Len() {
 		return vb.Interface(), nil
 	}
@@ -177,13 +177,13 @@ func mergeArray(va, vb reflect.Value) (interface{}, error) {
 }
 
 //nolint:unused
-func structToMap(v reflect.Value) (map[string]interface{}, error) {
+func structToMap(v reflect.Value) (map[string]any, error) {
 	v = derefValue(v)
 	if v.Kind() != reflect.Struct {
 		return nil, errNotStruct
 	}
 	t := v.Type()
-	result := make(map[string]interface{})
+	result := make(map[string]any)
 	for i := 0; i < t.NumField(); i++ {
 		field := t.Field(i)
 		if field.PkgPath != "" && !field.Anonymous {
@@ -218,7 +218,7 @@ func structToMap(v reflect.Value) (map[string]interface{}, error) {
 }
 
 //nolint:unused
-func mergeMapValues(a, b map[string]interface{}) (map[string]interface{}, error) {
+func mergeMapValues(a, b map[string]any) (map[string]any, error) {
 	va := reflect.ValueOf(a)
 	vb := reflect.ValueOf(b)
 	if va.Kind() != reflect.Map || vb.Kind() != reflect.Map {
@@ -228,7 +228,7 @@ func mergeMapValues(a, b map[string]interface{}) (map[string]interface{}, error)
 	if err != nil {
 		return nil, err
 	}
-	return mergedVal.(map[string]interface{}), nil
+	return mergedVal.(map[string]any), nil
 }
 
 func hasAttrs(t reflect.Type) (bool, error) {
diff --git a/unic.go b/unic.go
index 05e6251..9c03b21 100644
--- a/unic.go
+++ b/unic.go
@@ -76,12 +76,13 @@ func decodeTarget(v any) (reflect.Value, error) {
 
 // Marshal returns the UNIC encoding of v.
 // v must be a struct or a non-nil pointer to struct.
-func Marshal(args ...any) ([]byte, error) {
+func Marshal(args ...any) ([]byte, error) { //nolint:gocyclo
 	if len(args) == 0 {
 		return nil, nil
 	}
 
-	fieldsMap := make(map[string][]interface{})
+	fieldsMap := make(map[string][]any)
+	metaList := make([]*structMeta, 0, len(args))
 	for _, arg := range args {
 		rv, err := encodeTarget(arg)
 		if err != nil {
@@ -93,6 +94,8 @@ func Marshal(args ...any) ([]byte, error) {
 			return nil, err
 		}
 
+		metaList = append(metaList, meta)
+
 		for _, bf := range meta.fields {
 			if bf.attr > 0 {
 				continue
@@ -105,30 +108,56 @@ func Marshal(args ...any) ([]byte, error) {
 		}
 	}
 
-	mergedGroups := make(map[string][]interface{})
+	mergedGroups := make(map[string][]any)
 	for name, vals := range fieldsMap {
-		if len(vals) > 1 {
-			allStructs := true
-			hasAnyAttr := false
-			for _, val := range vals {
-				fv := marshalDeref(reflect.ValueOf(val))
-				if fv.Kind() != reflect.Struct {
-					allStructs = false
-					break
-				}
-				has, err := hasAttrs(fv.Type())
-				if err != nil {
+		if len(vals) <= 1 {
+			continue
+		}
+
+		allScalar := true
+		allStructs := true
+		hasAnyAttr := false
+
+		for _, val := range vals {
+			fv := marshalDeref(reflect.ValueOf(val))
+			if !fv.IsValid() {
+				continue
+			}
+
+			if !allScalar && !allStructs {
+				break
+			}
+
+			k := fv.Kind()
+
+			allStructs = allStructs && k == reflect.Struct
+			if allStructs && !hasAnyAttr {
+				var err error
+				if hasAnyAttr, err = hasAttrs(fv.Type()); err != nil {
 					return nil, err
 				}
-				if has {
-					hasAnyAttr = true
+			}
+
+			allScalar = allScalar && k != reflect.Struct && k != reflect.Map && k != reflect.Slice && k != reflect.Array
+		}
+
+		if allStructs && !hasAnyAttr {
+			mergedGroups[name] = vals
+			delete(fieldsMap, name)
+			continue
+		}
+
+		if allScalar {
+			allEqual := true
+			first := vals[0]
+			for i := 1; i < len(vals); i++ {
+				if !reflect.DeepEqual(first, vals[i]) {
+					allEqual = false
 					break
 				}
 			}
-			if allStructs && !hasAnyAttr {
-				mergedGroups[name] = vals
-				delete(fieldsMap, name)
-				continue
+			if allEqual {
+				fieldsMap[name] = []any{first}
 			}
 		}
 	}
@@ -138,28 +167,37 @@ func Marshal(args ...any) ([]byte, error) {
 
 	e := &encoder{buf: buf}
 
-	for name, vals := range mergedGroups {
-		if err := e.writeMergedBlock(name, vals, ""); err != nil {
-			return nil, err
-		}
-	}
+	for _, meta := range metaList {
+		for _, mf := range meta.fields {
 
-	for name, vals := range fieldsMap {
-		for _, val := range vals {
-			fv := reflect.ValueOf(val)
-			if fv.Kind() == reflect.Ptr && fv.IsNil() {
-				if err := e.writeEmptyBlock(name); err != nil {
+			if vals, ok := mergedGroups[mf.name]; ok {
+				if err := e.writeMergedBlock(mf.name, vals, ""); err != nil {
 					return nil, err
 				}
-				continue
+				delete(mergedGroups, mf.name)
 			}
-			fv = marshalDeref(fv)
-			if !fv.IsValid() {
+
+			vals, ok := fieldsMap[mf.name]
+			if !ok {
 				continue
 			}
-			f := &boundField{fieldTag: fieldTag{name: name}}
-			if err := e.writeNamed(f, fv, ""); err != nil {
-				return nil, err
+			delete(fieldsMap, mf.name)
+			for _, val := range vals {
+				fv := reflect.ValueOf(val)
+				if fv.Kind() == reflect.Ptr && fv.IsNil() {
+					if err := e.writeEmptyBlock(mf.name); err != nil {
+						return nil, err
+					}
+					continue
+				}
+				fv = marshalDeref(fv)
+				if !fv.IsValid() {
+					continue
+				}
+				f := &boundField{fieldTag: fieldTag{name: mf.name}}
+				if err := e.writeNamed(f, fv, ""); err != nil {
+					return nil, err
+				}
 			}
 		}
 	}
diff --git a/unic_test.go b/unic_test.go
index b0f43c2..93301a9 100644
--- a/unic_test.go
+++ b/unic_test.go
@@ -1,13 +1,13 @@
 package unic
 
 import (
+	"fmt"
 	"reflect"
 	"strings"
 	"testing"
 )
 
-const readmeConfig = `
-log_level 1;
+const readmeConfig = `log_level 1;
 servers {
 	domains ['localhost', 'local.host'];
 	server web { # веб
@@ -25,6 +25,7 @@ servers {
 		prefix /api/admin/v1; # префикс методов api для админки
 		middleware [log, oauth]; # набор миделвар
 	}
+	authBy [passwd, oauth];
 }
 `
 
@@ -45,9 +46,26 @@ type readmeConfigStruct struct {
 			Prefix     string   `unic:"prefix"`
 			Middleware []string `unic:"middleware"`
 		} `unic:"route"`
+		AuthBy []string `unic:"authBy"`
 	} `unic:"servers,desc='настройки серверов'"`
 }
 
+func TestUnit_Base(t *testing.T) {
+	var cfg readmeConfigStruct
+	if err := Unmarshal([]byte(readmeConfig), &cfg); err != nil {
+		t.Fatal(err)
+	}
+	b, err := Marshal(cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	excepted := "log_level 1;\nservers {\n\tdomains [localhost, local.host]; # список доменов\n\tserver web {\n\t\tport 80; # номер порта\n\t\thost 127.0.0.1; # IP или домен\n\t\tttl [1, 2, 3];\n\t\tssl [/etc/ssl/host1.pem, /etc/ssl/host1.pem]; # пути для сертификатов\n\t}\n\tserver admin {\n\t\tport 80; # номер порта\n\t\thost 127.0.0.2; # IP или домен\n\t\tauth (user1, passwd1, user2, passwd2);\n\t}\n\troute admin {\n\t\tprefix /api/admin/v1;\n\t\tmiddleware [log, oauth];\n\t}\n\tauthBy [passwd, oauth];\n}\n"
+	if string(b) != excepted {
+		fmt.Printf("got %q,\n\n want %q", string(b), excepted)
+		t.Errorf("got %s, want %s", string(b), excepted)
+	}
+}
+
 func TestUnit_UnmarshalREADME(t *testing.T) {
 	var cfg readmeConfigStruct
 	if err := Unmarshal([]byte(readmeConfig), &cfg); err != nil {
@@ -702,13 +720,33 @@ func TestUnit_UnmarshalUnknownFieldsIgnored(t *testing.T) {
 	}
 }
 
+func TestUnit_README_EXAMPLE(t *testing.T) {
+	type Part1 struct {
+		Common string `unic:"common"`
+		A      int    `unic:"a"`
+	}
+	type Part2 struct {
+		Common string `unic:"common"`
+		B      bool   `unic:"b"`
+	}
+
+	data, _ := Marshal(Part1{Common: "shared", A: 42}, Part2{Common: "shared", B: true})
+	excepted := `common shared;
+a 42;
+b true;
+`
+	if string(data) != excepted {
+		t.Fatalf("want=%q\ngot=%q", excepted, data)
+	}
+}
+
 /*
 goos: linux
 goarch: amd64
 pkg: go.osspkg.com/unic
 cpu: 12th Gen Intel(R) Core(TM) i9-12900KF
 Benchmark_Unmarshal
-Benchmark_Unmarshal-24    	  283897	      5598 ns/op	   10318 B/op	     185 allocs/op
+Benchmark_Unmarshal-4   	  299887	      3943 ns/op	   10917 B/op	     199 allocs/op
 PASS
 */
 func Benchmark_Unmarshal(b *testing.B) {
@@ -731,7 +769,7 @@ goarch: amd64
 pkg: go.osspkg.com/unic
 cpu: 12th Gen Intel(R) Core(TM) i9-12900KF
 Benchmark_Marshal
-Benchmark_Marshal-24      	 1685868	       707.7 ns/op	    1363 B/op	      35 allocs/op
+Benchmark_Marshal-4     	 1000000	      1272 ns/op	    1488 B/op	      37 allocs/op
 PASS
 */
 func Benchmark_Marshal(b *testing.B) {