diff --git a/examples/ex_github/oas_json_gen.go b/examples/ex_github/oas_json_gen.go
index c05327b37..c617fc31e 100644
--- a/examples/ex_github/oas_json_gen.go
+++ b/examples/ex_github/oas_json_gen.go
@@ -152811,12 +152811,17 @@ func (s *SearchReposOK) UnmarshalJSON(data []byte) error {
 // Encode encodes SearchResultTextMatches as json.
 func (s SearchResultTextMatches) Encode(e *jx.Encoder) {
 	unwrapped := []SearchResultTextMatchesItem(s)
-
-	e.ArrStart()
-	for _, elem := range unwrapped {
-		elem.Encode(e)
+	if unwrapped == nil {
+		e.ArrEmpty()
+		return
+	}
+	if unwrapped != nil {
+		e.ArrStart()
+		for _, elem := range unwrapped {
+			elem.Encode(e)
+		}
+		e.ArrEnd()
 	}
-	e.ArrEnd()
 }
 
 // Decode decodes SearchResultTextMatches from json.
diff --git a/examples/ex_github/oas_validators_gen.go b/examples/ex_github/oas_validators_gen.go
index 8320c5a61..cecd8ec99 100644
--- a/examples/ex_github/oas_validators_gen.go
+++ b/examples/ex_github/oas_validators_gen.go
@@ -4540,17 +4540,6 @@ func (s *CodeSearchResultItem) Validate() error {
 			Error: err,
 		})
 	}
-	if err := func() error {
-		if err := s.TextMatches.Validate(); err != nil {
-			return err
-		}
-		return nil
-	}(); err != nil {
-		failures = append(failures, validate.FieldError{
-			Name:  "text_matches",
-			Error: err,
-		})
-	}
 	if len(failures) > 0 {
 		return &validate.Error{Fields: failures}
 	}
@@ -4821,17 +4810,6 @@ func (s *CommitSearchResultItem) Validate() error {
 			Error: err,
 		})
 	}
-	if err := func() error {
-		if err := s.TextMatches.Validate(); err != nil {
-			return err
-		}
-		return nil
-	}(); err != nil {
-		failures = append(failures, validate.FieldError{
-			Name:  "text_matches",
-			Error: err,
-		})
-	}
 	if len(failures) > 0 {
 		return &validate.Error{Fields: failures}
 	}
@@ -7833,17 +7811,6 @@ func (s *IssueSearchResultItem) Validate() error {
 			Error: err,
 		})
 	}
-	if err := func() error {
-		if err := s.TextMatches.Validate(); err != nil {
-			return err
-		}
-		return nil
-	}(); err != nil {
-		failures = append(failures, validate.FieldError{
-			Name:  "text_matches",
-			Error: err,
-		})
-	}
 	if err := func() error {
 		if err := (validate.Float{}).Validate(float64(s.Score)); err != nil {
 			return errors.Wrap(err, "float")
@@ -8942,17 +8909,6 @@ func (s *LabelSearchResultItem) Validate() error {
 			Error: err,
 		})
 	}
-	if err := func() error {
-		if err := s.TextMatches.Validate(); err != nil {
-			return err
-		}
-		return nil
-	}(); err != nil {
-		failures = append(failures, validate.FieldError{
-			Name:  "text_matches",
-			Error: err,
-		})
-	}
 	if len(failures) > 0 {
 		return &validate.Error{Fields: failures}
 	}
@@ -15024,17 +14980,6 @@ func (s *RepoSearchResultItem) Validate() error {
 			Error: err,
 		})
 	}
-	if err := func() error {
-		if err := s.TextMatches.Validate(); err != nil {
-			return err
-		}
-		return nil
-	}(); err != nil {
-		failures = append(failures, validate.FieldError{
-			Name:  "text_matches",
-			Error: err,
-		})
-	}
 	if len(failures) > 0 {
 		return &validate.Error{Fields: failures}
 	}
@@ -18338,14 +18283,6 @@ func (s SearchReposSort) Validate() error {
 	}
 }
 
-func (s SearchResultTextMatches) Validate() error {
-	alias := ([]SearchResultTextMatchesItem)(s)
-	if alias == nil {
-		return errors.New("nil is invalid value")
-	}
-	return nil
-}
-
 func (s *SearchTopicsOK) Validate() error {
 	if s == nil {
 		return validate.ErrNilPointer
@@ -19821,17 +19758,6 @@ func (s *TopicSearchResultItem) Validate() error {
 			Error: err,
 		})
 	}
-	if err := func() error {
-		if err := s.TextMatches.Validate(); err != nil {
-			return err
-		}
-		return nil
-	}(); err != nil {
-		failures = append(failures, validate.FieldError{
-			Name:  "text_matches",
-			Error: err,
-		})
-	}
 	if err := func() error {
 		if value, ok := s.Related.Get(); ok {
 			if err := func() error {
@@ -19951,17 +19877,6 @@ func (s *UserSearchResultItem) Validate() error {
 			Error: err,
 		})
 	}
-	if err := func() error {
-		if err := s.TextMatches.Validate(); err != nil {
-			return err
-		}
-		return nil
-	}(); err != nil {
-		failures = append(failures, validate.FieldError{
-			Name:  "text_matches",
-			Error: err,
-		})
-	}
 	if len(failures) > 0 {
 		return &validate.Error{Fields: failures}
 	}
diff --git a/examples/ex_openapi/output.gen.go b/examples/ex_openapi/output.gen.go
index 5d4f206f3..4ee2020ac 100644
--- a/examples/ex_openapi/output.gen.go
+++ b/examples/ex_openapi/output.gen.go
@@ -7245,14 +7245,19 @@ func (s *Encodings) UnmarshalJSON(data []byte) error {
 // Encode encodes Enum as json.
 func (s Enum) Encode(e *jx.Encoder) {
 	unwrapped := []jx.Raw(s)
-
-	e.ArrStart()
-	for _, elem := range unwrapped {
-		if len(elem) != 0 {
-			e.Raw(elem)
+	if unwrapped == nil {
+		e.ArrEmpty()
+		return
+	}
+	if unwrapped != nil {
+		e.ArrStart()
+		for _, elem := range unwrapped {
+			if len(elem) != 0 {
+				e.Raw(elem)
+			}
 		}
+		e.ArrEnd()
 	}
-	e.ArrEnd()
 }
 
 // Decode decodes Enum from json.
@@ -17240,12 +17245,17 @@ func (s *SpecificationExtension) UnmarshalJSON(data []byte) error {
 // Encode encodes StringArray as json.
 func (s StringArray) Encode(e *jx.Encoder) {
 	unwrapped := []string(s)
-
-	e.ArrStart()
-	for _, elem := range unwrapped {
-		e.Str(elem)
+	if unwrapped == nil {
+		e.ArrEmpty()
+		return
+	}
+	if unwrapped != nil {
+		e.ArrStart()
+		for _, elem := range unwrapped {
+			e.Str(elem)
+		}
+		e.ArrEnd()
 	}
-	e.ArrEnd()
 }
 
 // Decode decodes StringArray from json.
@@ -18115,9 +18125,6 @@ func (s Encodings) Validate() error {
 
 func (s Enum) Validate() error {
 	alias := ([]jx.Raw)(s)
-	if alias == nil {
-		return errors.New("nil is invalid value")
-	}
 	if err := (validate.Array{
 		MinLength:    1,
 		MinLengthSet: true,
@@ -19594,9 +19601,6 @@ func (s *Spec) Validate() error {
 
 func (s StringArray) Validate() error {
 	alias := ([]string)(s)
-	if alias == nil {
-		return errors.New("nil is invalid value")
-	}
 	if err := (validate.Array{
 		MinLength:    1,
 		MinLengthSet: true,
diff --git a/gen/_template/json/encoders_alias.tmpl b/gen/_template/json/encoders_alias.tmpl
index ad4d8e35b..d65d30676 100644
--- a/gen/_template/json/encoders_alias.tmpl
+++ b/gen/_template/json/encoders_alias.tmpl
@@ -1,13 +1,20 @@
 {{- /*gotype: github.com/ogen-go/ogen/gen/ir.Type*/ -}}
 {{- define "json/encoders_alias" }}
+{{- $a := $.AliasTo }}
 // Encode encodes {{ $.Name }} as json.
 func (s {{ $.ReadOnlyReceiver }}) Encode(e *jx.Encoder) {
-	{{- if $.AliasTo.DoPassByPointer }}
-	unwrapped := (*{{ $.AliasTo.Go }})(s)
+	{{- if $a.DoPassByPointer }}
+		unwrapped := (*{{ $a.Go }})(s)
 	{{- else }}
-	unwrapped := {{ $.AliasTo.Go }}(s)
+		unwrapped := {{ $a.Go }}(s)
 	{{- end }}
-	{{ template "json/enc" elem $.AliasTo "unwrapped" -}}
+	{{- if and $a.IsArray $a.NilSemantic.Optional }}{{/* Prevents empty value encoding */}}
+		if unwrapped == nil {
+			e.ArrEmpty()
+			return
+		}
+	{{- end }}
+	{{ template "json/enc" elem $a "unwrapped" -}}
 }
 
 // Decode decodes {{ $.Name }} from json.
@@ -15,9 +22,9 @@ func (s *{{ $.Name }}) Decode(d *jx.Decoder) error {
 	if s == nil {
 		return errors.New({{ printf "invalid: unable to decode %s to nil" $.Name | quote }})
 	}
-	var unwrapped {{ $.AliasTo.Go }}
+	var unwrapped {{ $a.Go }}
 	if err := func() error {
-		{{- template "json/dec" elem $.AliasTo "unwrapped" }}
+		{{- template "json/dec" elem $a "unwrapped" }}
 		return nil
 	}(); err != nil {
 		return errors.Wrap(err, "alias")
diff --git a/gen/generics.go b/gen/generics.go
index 48f6e6f4e..cb5b11648 100644
--- a/gen/generics.go
+++ b/gen/generics.go
@@ -64,6 +64,7 @@ func boxType(t *ir.Type, v ir.GenericVariant) (*ir.Type, error) {
 	if dealiased.IsAlias() {
 		dealiased = dealiased.AliasTo
 	}
+
 	// Do not wrap if
 	//  * type is Any
 	//  * type is Stream
@@ -93,6 +94,7 @@ func boxType(t *ir.Type, v ir.GenericVariant) (*ir.Type, error) {
 			}
 			return ir.Generic(postfix, t, v), nil
 		}
+		dealiased.NilSemantic = t.NilSemantic
 
 		return t, nil
 	}