all: replace "interface{}" with "any"

60 files changed, 333 insertions, 324 deletions

diff --git a/lib/clise/clise.go b/lib/clise/clise.go
index a3acbbdd..036b8745 100644
--- a/lib/clise/clise.go
+++ b/lib/clise/clise.go
@@ -1,6 +1,6 @@
-// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package clise implements circular slice.
 // A circular slice is a slice that have fixed size.
@@ -29,7 +29,7 @@ import (
 
 // Clise define the circular slice implementation.
 type Clise struct {
-	v    []interface{}
+	v    []any
 	size int
 	last int
 	sync.Mutex
@@ -43,7 +43,7 @@ func New(size int) (c *Clise) {
 		return nil
 	}
 	c = &Clise{
-		v:    make([]interface{}, size),
+		v:    make([]any, size),
 		size: size,
 	}
 	return c
@@ -57,7 +57,7 @@ func (c *Clise) Close() error {
 
 // Pop remove the last Push()-ed item and return it to caller.
 // It will return nil if no more item inside it.
-func (c *Clise) Pop() (item interface{}) {
+func (c *Clise) Pop() (item any) {
 	c.Lock()
 	if c.over {
 		if c.last == 0 {
@@ -79,7 +79,7 @@ func (c *Clise) Pop() (item interface{}) {
 }
 
 // Push the item into the slice.
-func (c *Clise) Push(src ...interface{}) {
+func (c *Clise) Push(src ...any) {
 	var x int
 	c.Lock()
 	for ; x < len(src); x++ {
@@ -94,9 +94,9 @@ func (c *Clise) Push(src ...interface{}) {
 }
 
 // RecentSlice return the slice from index zero until the recent item.
-func (c *Clise) RecentSlice() (dst []interface{}) {
+func (c *Clise) RecentSlice() (dst []any) {
 	c.Lock()
-	dst = make([]interface{}, c.last)
+	dst = make([]any, c.last)
 	copy(dst, c.v[:c.last])
 	c.Unlock()
 	return dst
@@ -112,7 +112,7 @@ func (c *Clise) Reset() {
 
 // Slice return the content of circular slice as slice in the order of the
 // last item to the recent item.
-func (c *Clise) Slice() (dst []interface{}) {
+func (c *Clise) Slice() (dst []any) {
 	var (
 		end = c.size
 
@@ -123,10 +123,10 @@ func (c *Clise) Slice() (dst []interface{}) {
 	defer c.Unlock()
 
 	if c.over {
-		dst = make([]interface{}, c.size)
+		dst = make([]any, c.size)
 		start = c.last
 	} else {
-		dst = make([]interface{}, c.last)
+		dst = make([]any, c.last)
 		end = c.last
 	}
 
@@ -168,7 +168,7 @@ func (c *Clise) WriteString(s string) (n int, err error) {
 func (c *Clise) UnmarshalJSON(jsonb []byte) (err error) {
 	var (
 		logp  = `UnmarshalJSON`
-		array = make([]interface{}, 0)
+		array = make([]any, 0)
 	)
 
 	err = json.Unmarshal(jsonb, &array)
@@ -178,7 +178,7 @@ func (c *Clise) UnmarshalJSON(jsonb []byte) (err error) {
 
 	if c.size == 0 {
 		c.size = len(array)
-		c.v = make([]interface{}, c.size)
+		c.v = make([]any, c.size)
 	}
 
 	c.Push(array...)
diff --git a/lib/clise/clise_example_test.go b/lib/clise/clise_example_test.go
index b63655d5..422447e0 100644
--- a/lib/clise/clise_example_test.go
+++ b/lib/clise/clise_example_test.go
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
 package clise
 
 import "fmt"
@@ -5,7 +9,7 @@ import "fmt"
 func ExampleClise_Pop() {
 	var (
 		c    = New(5)
-		item interface{}
+		item any
 	)
 
 	c.Push(1, 2, 3, 4, 5, 6)
diff --git a/lib/contact/yahoo/field.go b/lib/contact/yahoo/field.go
index 3c07c69b..f10db06a 100644
--- a/lib/contact/yahoo/field.go
+++ b/lib/contact/yahoo/field.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package yahoo
 
@@ -25,9 +25,9 @@ const (
 // Field define a composite attribute in Contact.
 // Known value for Type: "phone", "name", "address".
 type Field struct {
-	Type  string      `json:"type"`
-	Value interface{} `json:"value"`
-	Flags []string    `json:"flags"`
+	Type  string   `json:"type"`
+	Value any      `json:"value"`
+	Flags []string `json:"flags"`
 
 	// Ignored fields for speedup.
 
@@ -39,14 +39,14 @@ type Field struct {
 
 // getValueType will return the Go type of field's Value.
 func (field *Field) getValueType() (
-	vmap map[string]interface{},
+	vmap map[string]any,
 	vstr string,
 	ok bool,
 ) {
 	ok = true
 
 	switch v := field.Value.(type) {
-	case map[string]interface{}:
+	case map[string]any:
 		vmap = v
 	case string:
 		vstr = v
@@ -66,7 +66,7 @@ func (field *Field) getFlag() string {
 }
 
 // decodeAddress will convert Yahoo address format to contact address format.
-func (field *Field) decodeAddress(flag string, vmap map[string]interface{}) (
+func (field *Field) decodeAddress(flag string, vmap map[string]any) (
 	adr contact.Address,
 ) {
 	adr = contact.Address{
diff --git a/lib/dns/resource_record.go b/lib/dns/resource_record.go
index d7762e9a..88047f1d 100644
--- a/lib/dns/resource_record.go
+++ b/lib/dns/resource_record.go
@@ -20,7 +20,7 @@ import (
 // resource record has the following format:
 type ResourceRecord struct {
 	// Value hold the generic, unpacked rdata based on Type.
-	Value interface{}
+	Value any
 
 	// A domain name to which this resource record pertains.
 	Name string
diff --git a/lib/dns/udp_client_pool.go b/lib/dns/udp_client_pool.go
index 8eaee5df..4b0a75de 100644
--- a/lib/dns/udp_client_pool.go
+++ b/lib/dns/udp_client_pool.go
@@ -1,6 +1,6 @@
-// Copyright 2019, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2019 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dns
 
@@ -62,7 +62,7 @@ func NewUDPClientPool(nameServers []string) (ucp *UDPClientPool, err error) {
 }
 
 // newClient create a new udp client.
-func (ucp *UDPClientPool) newClient() interface{} {
+func (ucp *UDPClientPool) newClient() any {
 	var (
 		cl  *UDPClient
 		err error
@@ -92,7 +92,7 @@ func (ucp *UDPClientPool) Get() *UDPClient {
 //
 // WARNING: any client connection that call Send(), MUST call Recv()
 // before putting client back to pool.  You have been warned.
-func (ucp *UDPClientPool) Put(cl interface{}) {
+func (ucp *UDPClientPool) Put(cl any) {
 	if cl != nil {
 		ucp.pool.Put(cl)
 	}
diff --git a/lib/dsv/configinterface.go b/lib/dsv/configinterface.go
index 04ea269c..2c5bad53 100644
--- a/lib/dsv/configinterface.go
+++ b/lib/dsv/configinterface.go
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
 package dsv
 
 import (
@@ -13,7 +17,7 @@ type ConfigInterface interface {
 }
 
 // ConfigOpen configuration file and initialize the attributes.
-func ConfigOpen(rw interface{}, fcfg string) error {
+func ConfigOpen(rw any, fcfg string) error {
 	cfg, e := os.ReadFile(fcfg)
 
 	if nil != e {
@@ -28,7 +32,7 @@ func ConfigOpen(rw interface{}, fcfg string) error {
 }
 
 // ConfigParse from JSON string.
-func ConfigParse(rw interface{}, cfg []byte) error {
+func ConfigParse(rw any, cfg []byte) error {
 	return json.Unmarshal(cfg, rw)
 }
 
diff --git a/lib/dsv/dsv.go b/lib/dsv/dsv.go
index 420b4221..f9dd859c 100644
--- a/lib/dsv/dsv.go
+++ b/lib/dsv/dsv.go
@@ -1,6 +1,6 @@
-// Copyright 2015-2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2015 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package dsv is a library for working with delimited separated value (DSV).
 //
@@ -58,7 +58,7 @@ type ReadWriter struct {
 }
 
 // New create a new ReadWriter object.
-func New(config string, dataset interface{}) (rw *ReadWriter, e error) {
+func New(config string, dataset any) (rw *ReadWriter, e error) {
 	rw = &ReadWriter{}
 
 	e = rw.Reader.Init(config, dataset)
diff --git a/lib/dsv/dsvinterface.go b/lib/dsv/dsvinterface.go
index 048de4b7..0249dd5f 100644
--- a/lib/dsv/dsvinterface.go
+++ b/lib/dsv/dsvinterface.go
@@ -1,6 +1,6 @@
-// Copyright 2015-2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2015 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dsv
 
@@ -14,7 +14,7 @@ import (
 // Return the reader contained data or error if failed.
 // Reader object upon returned has been closed, so if one need to read all
 // data in it simply set the `MaxRows` to `-1` in config file.
-func SimpleRead(fcfg string, dataset interface{}) (
+func SimpleRead(fcfg string, dataset any) (
 	reader ReaderInterface,
 	e error,
 ) {
@@ -60,7 +60,7 @@ func SimpleWrite(reader ReaderInterface, fcfg string) (nrows int, e error) {
 // - "DatasetMode" to "columns" to speeding up process.
 //
 // This function return the merged reader or error if failed.
-func SimpleMerge(fin1, fin2 string, dataset1, dataset2 interface{}) (
+func SimpleMerge(fin1, fin2 string, dataset1, dataset2 any) (
 	ReaderInterface,
 	error,
 ) {
diff --git a/lib/dsv/reader.go b/lib/dsv/reader.go
index 65334d95..4bde7060 100644
--- a/lib/dsv/reader.go
+++ b/lib/dsv/reader.go
@@ -1,6 +1,6 @@
-// Copyright 2015-2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2015 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dsv
 
@@ -65,7 +65,7 @@ const (
 // Thats it.
 type Reader struct {
 	// Dataset contains the content of input file after read.
-	dataset interface{}
+	dataset any
 
 	// fRead is read descriptor.
 	fRead *os.File
@@ -136,7 +136,7 @@ type Reader struct {
 }
 
 // NewReader create and initialize new instance of DSV Reader with default values.
-func NewReader(config string, dataset interface{}) (reader *Reader, e error) {
+func NewReader(config string, dataset any) (reader *Reader, e error) {
 	reader = &Reader{
 		Input:         "",
 		Skip:          0,
@@ -173,7 +173,7 @@ func NewReader(config string, dataset interface{}) (reader *Reader, e error) {
 //
 // (7) Open rejected file.
 // (8) Open input file.
-func (reader *Reader) Init(fcfg string, dataset interface{}) (e error) {
+func (reader *Reader) Init(fcfg string, dataset any) (e error) {
 	// (1)
 	if dataset == nil {
 		dataset = reader.GetDataset()
@@ -533,7 +533,7 @@ func (reader *Reader) IsEqual(other *Reader) bool {
 }
 
 // GetDataset return reader dataset.
-func (reader *Reader) GetDataset() interface{} {
+func (reader *Reader) GetDataset() any {
 	return reader.dataset
 }
 
diff --git a/lib/dsv/readerinterface.go b/lib/dsv/readerinterface.go
index 736b999d..c19115ab 100644
--- a/lib/dsv/readerinterface.go
+++ b/lib/dsv/readerinterface.go
@@ -1,6 +1,6 @@
-// Copyright 2015-2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2015 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package dsv
 
@@ -46,7 +46,7 @@ type ReaderInterface interface {
 	Reject(line []byte) (int, error)
 	Close() error
 
-	GetDataset() interface{}
+	GetDataset() any
 	MergeColumns(ReaderInterface)
 }
 
diff --git a/lib/errors/errors.go b/lib/errors/errors.go
index ae339241..3fc38cbd 100644
--- a/lib/errors/errors.go
+++ b/lib/errors/errors.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package errors provide an error type with code.
 package errors
@@ -51,7 +51,7 @@ func (e *E) Error() string {
 }
 
 // As set the target to e only if only target is **E.
-func (e *E) As(target interface{}) bool {
+func (e *E) As(target any) bool {
 	_, ok := target.(**E)
 	if ok {
 		val := reflect.ValueOf(target)
diff --git a/lib/http/endpoint_response.go b/lib/http/endpoint_response.go
index 64b539e1..c467677b 100644
--- a/lib/http/endpoint_response.go
+++ b/lib/http/endpoint_response.go
@@ -1,6 +1,6 @@
-// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package http
 
@@ -17,7 +17,7 @@ import liberrors "git.sr.ht/~shulhan/pakakeh.go/lib/errors"
 //
 // See the example below on how to use it with [Endpoint.Call] handler.
 type EndpointResponse struct {
-	Data interface{} `json:"data,omitempty"`
+	Data any `json:"data,omitempty"`
 
 	liberrors.E
 
diff --git a/lib/http/form.go b/lib/http/form.go
index 824a683b..e746b403 100644
--- a/lib/http/form.go
+++ b/lib/http/form.go
@@ -1,6 +1,6 @@
-// Copyright 2022, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2022 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package http
 
@@ -149,7 +149,7 @@ func MarshalForm(in any) (out url.Values, err error) {
 // not a pointer to a struct).
 // It will not return an error if one of the input value is not match with
 // field type.
-func UnmarshalForm(in url.Values, out interface{}) (err error) {
+func UnmarshalForm(in url.Values, out any) (err error) {
 	var (
 		logp  = `UnmarshalForm`
 		vout  = reflect.ValueOf(out)
diff --git a/lib/ini/ini.go b/lib/ini/ini.go
index 7bab0039..47eeb382 100644
--- a/lib/ini/ini.go
+++ b/lib/ini/ini.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ini
 
@@ -109,7 +109,7 @@ func Parse(text []byte) (in *Ini, err error) {
 //
 // One exception to above rule is map type.
 // A map's key will override the key defined in tag.
-func Marshal(v interface{}) (b []byte, err error) {
+func Marshal(v any) (b []byte, err error) {
 	rtipe := reflect.TypeOf(v)
 	rvalue := reflect.ValueOf(v)
 	kind := rtipe.Kind()
@@ -313,7 +313,7 @@ func (in *Ini) marshalStruct(
 // struct of `v`.
 // All the properties and specifications of field's tag follow the Marshal
 // function.
-func Unmarshal(b []byte, v interface{}) (err error) {
+func Unmarshal(b []byte, v any) (err error) {
 	ini, err := Parse(b)
 	if err != nil {
 		return err
@@ -324,7 +324,7 @@ func Unmarshal(b []byte, v interface{}) (err error) {
 
 // Unmarshal store the value from configuration, based on `ini` tag, into a
 // struct pointed by interface `v`.
-func (in *Ini) Unmarshal(v interface{}) (err error) {
+func (in *Ini) Unmarshal(v any) (err error) {
 	rtipe := reflect.TypeOf(v)
 	rvalue := reflect.ValueOf(v)
 	kind := rtipe.Kind()
diff --git a/lib/ini/ini_test.go b/lib/ini/ini_test.go
index b50869cc..db27ae7b 100644
--- a/lib/ini/ini_test.go
+++ b/lib/ini/ini_test.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ini
 
@@ -100,7 +100,7 @@ func TestData(t *testing.T) {
 				gotC   = &StructC{}
 				gotMap = &StructMap{}
 
-				obj    interface{}
+				obj    any
 				gotOut []byte
 				err    error
 			)
diff --git a/lib/ini/tag_struct_field_test.go b/lib/ini/tag_struct_field_test.go
index ab962dca..3d967946 100644
--- a/lib/ini/tag_struct_field_test.go
+++ b/lib/ini/tag_struct_field_test.go
@@ -1,6 +1,6 @@
-// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package ini
 
@@ -45,7 +45,7 @@ func TestUnpackStruct(t *testing.T) {
 		Bool     bool          `ini:"section::bool"`
 	}
 
-	var v interface{} = &T{
+	var v any = &T{
 		PtrStruct: &U{},
 	}
 
@@ -92,7 +92,7 @@ func TestUnpackStruct_embedded(t *testing.T) {
 		XX byte `ini:"c::xx"`
 	}
 
-	var v interface{} = &C{}
+	var v any = &C{}
 
 	rtype := reflect.TypeOf(v)
 	rval := reflect.ValueOf(v)
diff --git a/lib/json/json.go b/lib/json/json.go
index 081246e5..84df191d 100644
--- a/lib/json/json.go
+++ b/lib/json/json.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package json provide a library for working with JSON.
 //
@@ -101,12 +101,12 @@ func EscapeString(in string) string {
 	return string(outb)
 }
 
-// ToMapStringFloat64 convert the map of string-interface{} into map of
+// ToMapStringFloat64 convert the map of string-any into map of
 // string-float64.
 // This function convert the map's key to lower-cases and ignore zero value in
-// interface{}.
-// The interface{} value only accept basic numeric types and slice of byte.
-func ToMapStringFloat64(in map[string]interface{}) (out map[string]float64, err error) {
+// any.
+// The any value only accept basic numeric types and slice of byte.
+func ToMapStringFloat64(in map[string]any) (out map[string]float64, err error) {
 	out = make(map[string]float64, len(in))
 
 	for k, v := range in {
diff --git a/lib/json/json_test.go b/lib/json/json_test.go
index 5f3551dd..dac10da5 100644
--- a/lib/json/json_test.go
+++ b/lib/json/json_test.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package json
 
@@ -44,7 +44,7 @@ func TestEscapeString(t *testing.T) {
 }
 
 func TestToMapStringFloat64(t *testing.T) {
-	in := map[string]interface{}{
+	in := map[string]any{
 		"string": "1",
 		"zero":   "0",
 		"byte":   byte(3),
diff --git a/lib/math/big/float.go b/lib/math/big/float.go
index 336cf8b5..3e227f02 100644
--- a/lib/math/big/float.go
+++ b/lib/math/big/float.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package big
 
@@ -35,7 +35,7 @@ type Float struct {
 
 // AddFloat return the rounded sum `f[0]+f[1]+...`.
 // It will return nil if the first parameter is not convertable to Float.
-func AddFloat(f ...interface{}) *Float {
+func AddFloat(f ...any) *Float {
 	if len(f) == 0 {
 		return nil
 	}
@@ -55,7 +55,7 @@ func AddFloat(f ...interface{}) *Float {
 
 // NewFloat create and initialize new Float with default bit precision,
 // and rounding mode.
-func NewFloat(v interface{}) *Float {
+func NewFloat(v any) *Float {
 	return toFloat(v)
 }
 
@@ -70,7 +70,7 @@ func CreateFloat(v float64) Float {
 
 // MulFloat return the result of multiplication `f*g`.
 // It will return nil if `f` or `g` is not convertible to Float.
-func MulFloat(f, g interface{}) *Float {
+func MulFloat(f, g any) *Float {
 	ff := toFloat(f)
 	if ff == nil {
 		return nil
@@ -104,7 +104,7 @@ func ParseFloat(s string) (f *Float, err error) {
 }
 
 // QuoFloat return the quotient of `f/g` as new Float.
-func QuoFloat(f, g interface{}) *Float {
+func QuoFloat(f, g any) *Float {
 	ff := toFloat(f)
 	if ff == nil {
 		return nil
@@ -125,7 +125,7 @@ func SubFloat(f, g *Float) *Float {
 }
 
 // Add sets f to `f+g` and return the f as the result.
-func (f *Float) Add(g interface{}) *Float {
+func (f *Float) Add(g any) *Float {
 	gf := toFloat(g)
 	if gf == nil {
 		return nil
@@ -148,7 +148,7 @@ func (f *Float) Int64() int64 {
 }
 
 // IsEqual will return true if `f == g`.
-func (f *Float) IsEqual(g interface{}) bool {
+func (f *Float) IsEqual(g any) bool {
 	gf := toFloat(g)
 	if gf == nil {
 		return false
@@ -157,7 +157,7 @@ func (f *Float) IsEqual(g interface{}) bool {
 }
 
 // IsGreater will return true if `f > g`.
-func (f *Float) IsGreater(g interface{}) bool {
+func (f *Float) IsGreater(g any) bool {
 	gf := toFloat(g)
 	if gf == nil {
 		return false
@@ -166,7 +166,7 @@ func (f *Float) IsGreater(g interface{}) bool {
 }
 
 // IsGreaterOrEqual will return true if `f >= g`.
-func (f *Float) IsGreaterOrEqual(g interface{}) bool {
+func (f *Float) IsGreaterOrEqual(g any) bool {
 	gf := toFloat(g)
 	if gf == nil {
 		return false
@@ -175,7 +175,7 @@ func (f *Float) IsGreaterOrEqual(g interface{}) bool {
 }
 
 // IsLess will return true if `f < g`.
-func (f *Float) IsLess(g interface{}) bool {
+func (f *Float) IsLess(g any) bool {
 	gf := toFloat(g)
 	if gf == nil {
 		return false
@@ -184,7 +184,7 @@ func (f *Float) IsLess(g interface{}) bool {
 }
 
 // IsLessOrEqual will return true if `f <= g`.
-func (f *Float) IsLessOrEqual(g interface{}) bool {
+func (f *Float) IsLessOrEqual(g any) bool {
 	gf := toFloat(g)
 	if gf == nil {
 		return false
@@ -210,7 +210,7 @@ func (f *Float) MarshalJSON() ([]byte, error) {
 
 // Mul sets f to product of `f * g` and return the result as f.
 // If g is not convertible to Float it will return nil.
-func (f *Float) Mul(g interface{}) *Float {
+func (f *Float) Mul(g any) *Float {
 	gf := toFloat(g)
 	if gf == nil {
 		return nil
@@ -232,7 +232,7 @@ func (f *Float) ParseFloat(s string) (err error) {
 
 // Quo sets f to quotient of `f/g` and return the result as f.
 // If g is not convertible to Float it will return nil.
-func (f *Float) Quo(g interface{}) *Float {
+func (f *Float) Quo(g any) *Float {
 	gf := toFloat(g)
 	if gf == nil {
 		return nil
@@ -261,7 +261,7 @@ func (f *Float) String() string {
 }
 
 // Sub sets f to rounded difference `f-g` and return f.
-func (f *Float) Sub(g interface{}) *Float {
+func (f *Float) Sub(g any) *Float {
 	gf := toFloat(g)
 	if gf == nil {
 		return nil
@@ -280,7 +280,7 @@ func (f *Float) UnmarshalJSON(in []byte) (err error) {
 }
 
 // toFloat convert v type to Float or nil if v type is unknown.
-func toFloat(g interface{}) (out *Float) {
+func toFloat(g any) (out *Float) {
 	out = &Float{}
 	out.SetPrec(DefaultBitPrecision).SetMode(DefaultRoundingMode)
 
diff --git a/lib/math/big/float_test.go b/lib/math/big/float_test.go
index e7551f97..a8e578d4 100644
--- a/lib/math/big/float_test.go
+++ b/lib/math/big/float_test.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package big
 
@@ -30,7 +30,7 @@ func TestFloat_IsEqual(t *testing.T) {
 	f := NewFloat(1)
 
 	cases := []struct {
-		g   interface{}
+		g   any
 		exp bool
 	}{{
 		g:   byte(1),
diff --git a/lib/math/big/int.go b/lib/math/big/int.go
index bfb13bb7..1f6b08d5 100644
--- a/lib/math/big/int.go
+++ b/lib/math/big/int.go
@@ -1,6 +1,6 @@
-// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package big
 
@@ -21,7 +21,7 @@ type Int struct {
 
 // NewInt create and initialize new Int value from v or nil if v is invalid
 // type that cannot be converted to Int.
-func NewInt(v interface{}) (i *Int) {
+func NewInt(v any) (i *Int) {
 	i = &Int{}
 
 	got := toInt(v, i)
@@ -32,7 +32,7 @@ func NewInt(v interface{}) (i *Int) {
 }
 
 // Add set the i value to i + v and return the i as the result.
-func (i *Int) Add(v interface{}) *Int {
+func (i *Int) Add(v any) *Int {
 	vv := toInt(v, nil)
 	if vv == nil {
 		// Its equal to `i+0`
@@ -43,7 +43,7 @@ func (i *Int) Add(v interface{}) *Int {
 }
 
 // IsGreater will return true if i > v.
-func (i *Int) IsGreater(v interface{}) bool {
+func (i *Int) IsGreater(v any) bool {
 	vv := toInt(v, nil)
 	if vv == nil {
 		return false
@@ -52,7 +52,7 @@ func (i *Int) IsGreater(v interface{}) bool {
 }
 
 // IsLess will return true if i < v.
-func (i *Int) IsLess(v interface{}) bool {
+func (i *Int) IsLess(v any) bool {
 	vv := toInt(v, nil)
 	if vv == nil {
 		return false
@@ -84,7 +84,7 @@ func (i *Int) MarshalJSON() ([]byte, error) {
 }
 
 // Scan implement the database's sql.Scan interface.
-func (i *Int) Scan(src interface{}) error {
+func (i *Int) Scan(src any) error {
 	got := toInt(src, i)
 	if got == nil {
 		return fmt.Errorf("Int.Scan: unknown type %T", src)
@@ -114,7 +114,7 @@ func (i *Int) Value() (driver.Value, error) {
 
 // toInt convert any type to Int or nil if type is unknown.
 // If in is not nil, it will be set to out.
-func toInt(v interface{}, in *Int) (out *Int) {
+func toInt(v any, in *Int) (out *Int) {
 	out = &Int{}
 
 	switch v := v.(type) {
diff --git a/lib/math/big/int_test.go b/lib/math/big/int_test.go
index 61cf1a92..d079111d 100644
--- a/lib/math/big/int_test.go
+++ b/lib/math/big/int_test.go
@@ -1,6 +1,6 @@
-// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package big
 
@@ -13,7 +13,7 @@ import (
 
 func TestNewInt(t *testing.T) {
 	cases := []struct {
-		v   interface{}
+		v   any
 		exp string
 	}{{
 		v:   []byte("123.45"),
diff --git a/lib/math/big/rat.go b/lib/math/big/rat.go
index 4491f67d..db2b6049 100644
--- a/lib/math/big/rat.go
+++ b/lib/math/big/rat.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package big
 
@@ -25,7 +25,7 @@ type Rat struct {
 
 // AddRat return the sum of `f[0]+f[1]+...`.
 // It will return nil if the first parameter is not convertable to Rat.
-func AddRat(f ...interface{}) *Rat {
+func AddRat(f ...any) *Rat {
 	if len(f) == 0 {
 		return nil
 	}
@@ -48,13 +48,13 @@ func AddRat(f ...interface{}) *Rat {
 //
 // Empty string or empty []byte still considered as valid, and it will return
 // it as zero.
-func NewRat(v interface{}) (r *Rat) {
+func NewRat(v any) (r *Rat) {
 	return toRat(v)
 }
 
 // MulRat return the result of multiplication `f[0]*f[1]*...`.
 // It will return nil if the first parameter is not convertable to Rat.
-func MulRat(f ...interface{}) *Rat {
+func MulRat(f ...any) *Rat {
 	if len(f) == 0 {
 		return nil
 	}
@@ -77,7 +77,7 @@ func MulRat(f ...interface{}) *Rat {
 // It will return nil if the first parameter is not convertable to Rat.
 // If the second or rest of parameters can not be converted to Rat or zero it
 // will return nil instead of panic.
-func QuoRat(f ...interface{}) *Rat {
+func QuoRat(f ...any) *Rat {
 	if len(f) == 0 {
 		return nil
 	}
@@ -97,7 +97,7 @@ func QuoRat(f ...interface{}) *Rat {
 
 // SubRat return the result of subtraction `f[0]-f[1]-...` as new Rat.
 // It will return nil if the first parameter is not convertable to Rat.
-func SubRat(f ...interface{}) *Rat {
+func SubRat(f ...any) *Rat {
 	if len(f) == 0 {
 		return nil
 	}
@@ -126,7 +126,7 @@ func (r *Rat) Abs() *Rat {
 
 // Add sets r to `r+g` and return the r as the result.
 // If g is not convertable to Rat it will equal to r+0.
-func (r *Rat) Add(g interface{}) *Rat {
+func (r *Rat) Add(g any) *Rat {
 	if r == nil {
 		return nil
 	}
@@ -184,7 +184,7 @@ func (r *Rat) Int64() int64 {
 // Unlike the standard Cmp(), if the first call to Cmp is not 0, it will try
 // to compare the string values of r and g, truncated by
 // DefaultDigitPrecision.
-func (r *Rat) IsEqual(g interface{}) bool {
+func (r *Rat) IsEqual(g any) bool {
 	y := toRat(g)
 	if y == nil {
 		return r == nil
@@ -203,7 +203,7 @@ func (r *Rat) IsEqual(g interface{}) bool {
 
 // IsGreater will return true if `r > g`.
 // If g is not convertable to Rat it will return false.
-func (r *Rat) IsGreater(g interface{}) bool {
+func (r *Rat) IsGreater(g any) bool {
 	if r == nil {
 		return false
 	}
@@ -216,7 +216,7 @@ func (r *Rat) IsGreater(g interface{}) bool {
 
 // IsGreaterOrEqual will return true if `r >= g`.
 // If g is not convertable to Rat it will return false.
-func (r *Rat) IsGreaterOrEqual(g interface{}) bool {
+func (r *Rat) IsGreaterOrEqual(g any) bool {
 	if r == nil {
 		return false
 	}
@@ -237,7 +237,7 @@ func (r *Rat) IsGreaterThanZero() bool {
 
 // IsLess will return true if `r < g`.
 // If r is nill or g is not convertable to Rat it will return false.
-func (r *Rat) IsLess(g interface{}) bool {
+func (r *Rat) IsLess(g any) bool {
 	if r == nil {
 		return false
 	}
@@ -250,7 +250,7 @@ func (r *Rat) IsLess(g interface{}) bool {
 
 // IsLessOrEqual will return true if `r <= g`.
 // It r is nil or g is not convertable to Rat it will return false.
-func (r *Rat) IsLessOrEqual(g interface{}) bool {
+func (r *Rat) IsLessOrEqual(g any) bool {
 	if r == nil {
 		return false
 	}
@@ -298,7 +298,7 @@ func (r *Rat) MarshalJSON() ([]byte, error) {
 
 // Mul sets r to product of `r * g` and return the result as r.
 // If g is not convertible to Rat it will return nil.
-func (r *Rat) Mul(g interface{}) *Rat {
+func (r *Rat) Mul(g any) *Rat {
 	y := toRat(g)
 	if y == nil {
 		return nil
@@ -316,7 +316,7 @@ func (r *Rat) Mul(g interface{}) *Rat {
 
 // Quo sets r to quotient of `r/g` and return the result as r.
 // If r is nil or g is not convertible to Rat or zero it will return nil.
-func (r *Rat) Quo(g interface{}) *Rat {
+func (r *Rat) Quo(g any) *Rat {
 	if r == nil {
 		return nil
 	}
@@ -383,7 +383,7 @@ func (r *Rat) RoundToZero(prec int) *Rat {
 }
 
 // Scan implement the database's sql.Scan interface.
-func (r *Rat) Scan(v interface{}) error {
+func (r *Rat) Scan(v any) error {
 	got := toRat(v)
 	if got == nil {
 		return fmt.Errorf("Rat.Scan: unknown type %T", v)
@@ -426,7 +426,7 @@ func (r *Rat) String() string {
 
 // Sub sets r to rounded difference `r-g` and return r.
 // If g is not convertable to Rat, it will return as r-0.
-func (r *Rat) Sub(g interface{}) *Rat {
+func (r *Rat) Sub(g any) *Rat {
 	if r == nil {
 		return nil
 	}
@@ -464,7 +464,7 @@ func (r *Rat) Value() (driver.Value, error) {
 }
 
 // toRat convert v type to Rat or nil if v type is unknown.
-func toRat(g interface{}) (out *Rat) {
+func toRat(g any) (out *Rat) {
 	out = &Rat{}
 
 	switch v := g.(type) {
diff --git a/lib/math/big/rat_example_test.go b/lib/math/big/rat_example_test.go
index d1669765..602041de 100644
--- a/lib/math/big/rat_example_test.go
+++ b/lib/math/big/rat_example_test.go
@@ -1,6 +1,6 @@
-// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package big
 
@@ -49,7 +49,7 @@ func ExampleNewRat() {
 		stdRat    big.Rat
 		nilRat    *Rat
 	)
-	inputs := []interface{}{
+	inputs := []any{
 		nil,
 		[]byte{},
 		"",
@@ -576,7 +576,7 @@ func ExampleRat_Scan() {
 		err error
 	)
 
-	inputs := []interface{}{
+	inputs := []any{
 		1234,
 		nil,
 		"0.0001",
@@ -599,7 +599,7 @@ func ExampleRat_Scan() {
 }
 
 func ExampleRat_String() {
-	inputs := []interface{}{
+	inputs := []any{
 		nil,
 		"12345",
 		"0.00000000",
@@ -677,7 +677,7 @@ func ExampleRat_UnmarshalJSON_withStruct() {
 }
 
 func ExampleRat_Value() {
-	inputs := []interface{}{
+	inputs := []any{
 		nil,
 		0,
 		1.2345,
diff --git a/lib/memfs/node.go b/lib/memfs/node.go
index 5de22c54..ab75be68 100644
--- a/lib/memfs/node.go
+++ b/lib/memfs/node.go
@@ -1,4 +1,5 @@
 // SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
 // SPDX-License-Identifier: BSD-3-Clause
 
 package memfs
@@ -369,7 +370,7 @@ func (node *Node) Stat() (os.FileInfo, error) {
 }
 
 // Sys return the underlying data source (can return nil).
-func (node *Node) Sys() interface{} {
+func (node *Node) Sys() any {
 	return node
 }
 
diff --git a/lib/mining/classifier/cart/cart.go b/lib/mining/classifier/cart/cart.go
index b47a4852..2a26e71e 100644
--- a/lib/mining/classifier/cart/cart.go
+++ b/lib/mining/classifier/cart/cart.go
@@ -1,6 +1,6 @@
-// Copyright 2015 Mhd Sulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2015 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package cart implement the Classification and Regression Tree by Breiman, et al.
 // CART is binary decision tree.
@@ -155,7 +155,7 @@ func (runtime *Runtime) splitTreeByGain(claset tabula.ClasetInterface) (
 	// If its continuous, split the attribute using numeric value.
 	// If its discrete, split the attribute using subset (partition) of
 	// nominal values.
-	var splitV interface{}
+	var splitV any
 
 	if MaxGain.IsContinu {
 		splitV = MaxGain.GetMaxPartGainValue()
diff --git a/lib/mining/classifier/cart/node.go b/lib/mining/classifier/cart/node.go
index 0317704d..3e95cc04 100644
--- a/lib/mining/classifier/cart/node.go
+++ b/lib/mining/classifier/cart/node.go
@@ -1,6 +1,6 @@
-// Copyright 2015 Mhd Sulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2015 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package cart
 
@@ -12,7 +12,7 @@ import (
 // NodeValue of tree in CART.
 type NodeValue struct {
 	// SplitV define the split value.
-	SplitV interface{}
+	SplitV any
 
 	// Class of leaf node.
 	Class string
diff --git a/lib/mining/gain/gini/gini.go b/lib/mining/gain/gini/gini.go
index 58c7fd5a..f9b61e4b 100644
--- a/lib/mining/gain/gini/gini.go
+++ b/lib/mining/gain/gini/gini.go
@@ -1,6 +1,6 @@
-// Copyright 2015 Mhd Sulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2015 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package gini contain function to calculating Gini gain.
 //
@@ -307,7 +307,7 @@ func (gini *Gini) computeContinuGain(src *[]float64, target, classes *[]string)
 }
 
 // GetMaxPartGainValue return the partition that have the maximum Gini gain.
-func (gini *Gini) GetMaxPartGainValue() interface{} {
+func (gini *Gini) GetMaxPartGainValue() any {
 	if gini.IsContinu {
 		return gini.ContinuPart[gini.MaxPartGain]
 	}
@@ -322,7 +322,7 @@ func (gini *Gini) GetMaxGainValue() float64 {
 }
 
 // GetMinIndexPartValue return the partition that have the minimum Gini index.
-func (gini *Gini) GetMinIndexPartValue() interface{} {
+func (gini *Gini) GetMinIndexPartValue() any {
 	if gini.IsContinu {
 		return gini.ContinuPart[gini.MinIndexPart]
 	}
diff --git a/lib/mining/tree/binary/btnode.go b/lib/mining/tree/binary/btnode.go
index ad8c0876..d8b78b92 100644
--- a/lib/mining/tree/binary/btnode.go
+++ b/lib/mining/tree/binary/btnode.go
@@ -1,6 +1,6 @@
-// Copyright 2015 Mhd Sulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2015 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package binary
 
@@ -18,11 +18,11 @@ type BTNode struct {
 	// Parent of node.
 	Parent *BTNode
 	// Value of node.
-	Value interface{}
+	Value any
 }
 
 // NewBTNode create new node for binary tree.
-func NewBTNode(v interface{}, l *BTNode, r *BTNode) (p *BTNode) {
+func NewBTNode(v any, l *BTNode, r *BTNode) (p *BTNode) {
 	p = &BTNode{
 		Left:   l,
 		Right:  r,
diff --git a/lib/mlog/mlog.go b/lib/mlog/mlog.go
index 155a2500..a22867c2 100644
--- a/lib/mlog/mlog.go
+++ b/lib/mlog/mlog.go
@@ -1,6 +1,6 @@
-// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 // Package mlog implement buffered multi writers of log.
 // It can have zero or more normal writers (for example, os.Stdout and
@@ -49,12 +49,12 @@ var defaultMLog = createMultiLogger(defTimeFormat, ``,
 // The default registered error writer is os.Stderr.
 //
 // If the generated string does not end with new line, it will be added.
-func Errf(format string, v ...interface{}) {
+func Errf(format string, v ...any) {
 	defaultMLog.Errf(format, v...)
 }
 
 // Fatalf is equal to Errf and os.Exit(1).
-func Fatalf(format string, v ...interface{}) {
+func Fatalf(format string, v ...any) {
 	defaultMLog.Fatalf(format, v...)
 }
 
@@ -67,12 +67,12 @@ func Flush() {
 // The default registered output writer is os.Stdout.
 //
 // If the generated string does not end with new line, it will be added.
-func Outf(format string, v ...interface{}) {
+func Outf(format string, v ...any) {
 	defaultMLog.Outf(format, v...)
 }
 
 // Panicf is equal to Errf followed by panic.
-func Panicf(format string, v ...interface{}) {
+func Panicf(format string, v ...any) {
 	defaultMLog.Panicf(format, v...)
 }
 
diff --git a/lib/mlog/multi_logger.go b/lib/mlog/multi_logger.go
index bf8c3b87..899bc304 100644
--- a/lib/mlog/multi_logger.go
+++ b/lib/mlog/multi_logger.go
@@ -56,7 +56,7 @@ func createMultiLogger(timeFormat, prefix string, outs, errs []NamedWriter) (mlo
 
 	mlog = &MultiLogger{
 		bufPool: &sync.Pool{
-			New: func() interface{} {
+			New: func() any {
 				return new(bytes.Buffer)
 			},
 		},
@@ -124,12 +124,12 @@ func (mlog *MultiLogger) Close() {
 // writers.
 //
 // If the generated string does not end with new line, it will be added.
-func (mlog *MultiLogger) Errf(format string, v ...interface{}) {
+func (mlog *MultiLogger) Errf(format string, v ...any) {
 	mlog.writeTo(mlog.qerr, format, v...)
 }
 
 // Fatalf is equal to Errf and os.Exit(1).
-func (mlog *MultiLogger) Fatalf(format string, v ...interface{}) {
+func (mlog *MultiLogger) Fatalf(format string, v ...any) {
 	mlog.Errf(format, v...)
 	mlog.Flush()
 	os.Exit(1)
@@ -152,12 +152,12 @@ func (mlog *MultiLogger) Flush() {
 // Outf write the formatted string and its values to all output writers.
 //
 // If the generated string does not end with new line, it will be added.
-func (mlog *MultiLogger) Outf(format string, v ...interface{}) {
+func (mlog *MultiLogger) Outf(format string, v ...any) {
 	mlog.writeTo(mlog.qout, format, v...)
 }
 
 // Panicf is equal to Errf and followed by panic.
-func (mlog *MultiLogger) Panicf(format string, v ...interface{}) {
+func (mlog *MultiLogger) Panicf(format string, v ...any) {
 	mlog.Errf(format, v...)
 	mlog.Flush()
 	var msg = fmt.Sprintf(format, v...)
@@ -288,7 +288,7 @@ func (mlog *MultiLogger) processOutputQueue() {
 	mlog.flushq <- struct{}{}
 }
 
-func (mlog *MultiLogger) writeTo(q chan []byte, format string, v ...interface{}) {
+func (mlog *MultiLogger) writeTo(q chan []byte, format string, v ...any) {
 	mlog.Lock()
 	if mlog.isClosed {
 		mlog.Unlock()
diff --git a/lib/paseto/example_public_mode_test.go b/lib/paseto/example_public_mode_test.go
index 6e076b69..a821c93b 100644
--- a/lib/paseto/example_public_mode_test.go
+++ b/lib/paseto/example_public_mode_test.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package paseto
 
@@ -47,7 +47,7 @@ func ExamplePublicMode() {
 		log.Fatal(err)
 	}
 
-	footer := map[string]interface{}{
+	footer := map[string]any{
 		"FOOTER": "HERE",
 	}
 	token, err := sender.Pack(receiverKey.ID, subjectMessage, []byte("hello receiver"), footer)
diff --git a/lib/paseto/json_footer.go b/lib/paseto/json_footer.go
index fe037ffb..990ee688 100644
--- a/lib/paseto/json_footer.go
+++ b/lib/paseto/json_footer.go
@@ -1,12 +1,12 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package paseto
 
 // JSONFooter define the optional metadata and data at the footer of the
 // token that are not included in signature.
 type JSONFooter struct {
-	Data map[string]interface{} `json:"data,omitempty"`
-	KID  string                 `json:"kid"`
+	Data map[string]any `json:"data,omitempty"`
+	KID  string         `json:"kid"`
 }
diff --git a/lib/paseto/public_mode.go b/lib/paseto/public_mode.go
index 46177ba7..b43b56d3 100644
--- a/lib/paseto/public_mode.go
+++ b/lib/paseto/public_mode.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package paseto
 
@@ -106,7 +106,7 @@ func (auth *PublicMode) RemovePeer(id string) {
 }
 
 // Pack the data into token.
-func (auth *PublicMode) Pack(audience, subject string, data []byte, footer map[string]interface{}) (
+func (auth *PublicMode) Pack(audience, subject string, data []byte, footer map[string]any) (
 	token string, err error,
 ) {
 	now := time.Now().Round(time.Second)
diff --git a/lib/reflect/example_test.go b/lib/reflect/example_test.go
index f69c45d1..c0b028a3 100644
--- a/lib/reflect/example_test.go
+++ b/lib/reflect/example_test.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package reflect_test
 
@@ -82,9 +82,9 @@ func ExampleIsNil() {
 	)
 
 	cases := []struct {
-		v interface{}
+		v any
 	}{
-		{}, // Uninitialized interface{}.
+		{}, // Uninitialized any.
 		{v: aBoolean},
 		{v: aChannel},          // Uninitialized channel.
 		{v: aFunction},         // Empty func type.
@@ -97,7 +97,7 @@ func ExampleIsNil() {
 		{v: anInt},
 		{v: emptyError},
 		{v: errors.New("e")}, // Initialized error.
-		{v: fs},              // Uninitialized interface type to interface{}.
+		{v: fs},              // Uninitialized interface type to any.
 	}
 
 	for _, c := range cases {
diff --git a/lib/reflect/reflect.go b/lib/reflect/reflect.go
index f5f917f5..c3ff568c 100644
--- a/lib/reflect/reflect.go
+++ b/lib/reflect/reflect.go
@@ -23,7 +23,7 @@ const (
 // [Equal] method in that struct to compare the values.
 // A struct's field tagged with `noequal:""` will be skipped from being
 // processed.
-func DoEqual(x, y interface{}) (err error) {
+func DoEqual(x, y any) (err error) {
 	if x == nil && y == nil {
 		return nil
 	}
@@ -45,7 +45,7 @@ func DoEqual(x, y interface{}) (err error) {
 // [Equal] method in that struct to compare the values.
 // A struct's field tagged with `noequal:""` will be skipped from being
 // processed.
-func IsEqual(x, y interface{}) bool {
+func IsEqual(x, y any) bool {
 	if x == nil && y == nil {
 		return true
 	}
@@ -60,7 +60,7 @@ func IsEqual(x, y interface{}) bool {
 
 // IsNil will return true if v's type is chan, func, interface, map, pointer,
 // or slice and its value is `nil`; otherwise it will return false.
-func IsNil(v interface{}) bool {
+func IsNil(v any) bool {
 	var val = reflect.ValueOf(v)
 	var kind = val.Kind()
 
@@ -86,7 +86,7 @@ func IsNil(v interface{}) bool {
 //
 // If obj is nil or none of the method exist it will return nil without an
 // error.
-func Marshal(obj interface{}) (out []byte, err error) {
+func Marshal(obj any) (out []byte, err error) {
 	var (
 		logp        = "Marshal"
 		methodNames = []string{
@@ -100,7 +100,7 @@ func Marshal(obj interface{}) (out []byte, err error) {
 		methodName string
 		method     reflect.Value
 		callOut    []reflect.Value
-		callReturn interface{}
+		callReturn any
 		ok         bool
 	)
 
@@ -285,7 +285,7 @@ func setValue(obj reflect.Value, val string) (err error) {
 		objKind = obj.Kind()
 
 		objValue reflect.Value
-		v        interface{}
+		v        any
 	)
 
 	for objKind == reflect.Ptr {
@@ -438,7 +438,7 @@ func Unmarshal(obj reflect.Value, val []byte) (ok bool, err error) {
 		objValue   reflect.Value
 		method     reflect.Value
 		callOut    []reflect.Value
-		callReturn interface{}
+		callReturn any
 		methodName string
 	)
 
@@ -550,12 +550,12 @@ func Tag(field reflect.StructField, tag string) (val string, opts []string, hasT
 
 // doEqual compare two kind of objects and return nils if both are equal.
 //
-// If its not equal, it will return the interface{} value of v1 and v2 and
+// If its not equal, it will return the any value of v1 and v2 and
 // additional error message which describe the type and value where its not
 // matched.
 func doEqual(v1, v2 reflect.Value) (err error) {
 	var (
-		in1, in2 interface{}
+		in1, in2 any
 	)
 
 	if !v1.IsValid() || !v2.IsValid() {
diff --git a/lib/reflect/reflect_test.go b/lib/reflect/reflect_test.go
index 7f839ed6..5243d733 100644
--- a/lib/reflect/reflect_test.go
+++ b/lib/reflect/reflect_test.go
@@ -1,6 +1,6 @@
-// Copyright 2022, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2022 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package reflect
 
@@ -23,8 +23,8 @@ func TestAppendSlice(t *testing.T) {
 	)
 
 	type testCase struct {
-		obj  interface{}
-		exp  interface{}
+		obj  any
+		exp  any
 		desc string
 		vals []string
 	}
diff --git a/lib/sql/session.go b/lib/sql/session.go
index fc1c5c1e..62650410 100644
--- a/lib/sql/session.go
+++ b/lib/sql/session.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package sql
 
@@ -11,12 +11,12 @@ import (
 
 // Session is an interface that represent both sql.DB and sql.Tx.
 type Session interface {
-	Exec(query string, args ...interface{}) (sql.Result, error)
-	ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
+	Exec(query string, args ...any) (sql.Result, error)
+	ExecContext(ctx context.Context, query string, args ...any) (sql.Result, error)
 	Prepare(query string) (*sql.Stmt, error)
 	PrepareContext(ctx context.Context, query string) (*sql.Stmt, error)
-	Query(query string, args ...interface{}) (*sql.Rows, error)
-	QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
-	QueryRow(query string, args ...interface{}) *sql.Row
-	QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
+	Query(query string, args ...any) (*sql.Rows, error)
+	QueryContext(ctx context.Context, query string, args ...any) (*sql.Rows, error)
+	QueryRow(query string, args ...any) *sql.Row
+	QueryRowContext(ctx context.Context, query string, args ...any) *sql.Row
 }
diff --git a/lib/ssh/sftp/file_attrs.go b/lib/ssh/sftp/file_attrs.go
index 87ffc763..a4a8995d 100644
--- a/lib/ssh/sftp/file_attrs.go
+++ b/lib/ssh/sftp/file_attrs.go
@@ -1,6 +1,6 @@
-// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package sftp
 
@@ -258,7 +258,7 @@ func (fa *FileAttrs) Size() int64 {
 
 // Sys return the pointer to [FileAttrs] itself.
 // This method is added to comply with [fs.FileInfo] interface.
-func (fa *FileAttrs) Sys() interface{} {
+func (fa *FileAttrs) Sys() any {
 	return fa
 }
 
diff --git a/lib/strings/to.go b/lib/strings/to.go
index cc8649ef..6b46a724 100644
--- a/lib/strings/to.go
+++ b/lib/strings/to.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package strings
 
@@ -63,7 +63,7 @@ func ToInt64(ss []string) (sv []int64) {
 }
 
 // ToStrings convert slice of interface to slice of string.
-func ToStrings(is []interface{}) (vs []string) {
+func ToStrings(is []any) (vs []string) {
 	for x := 0; x < len(is); x++ {
 		v := fmt.Sprintf("%v", is[x])
 		vs = append(vs, v)
diff --git a/lib/strings/to_example_test.go b/lib/strings/to_example_test.go
index 59dc8db7..52a430e7 100644
--- a/lib/strings/to_example_test.go
+++ b/lib/strings/to_example_test.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package strings
 
@@ -40,7 +40,7 @@ func ExampleToInt64() {
 
 func ExampleToStrings() {
 	var (
-		i64 = []interface{}{0, 1.99, 2, 3}
+		i64 = []any{0, 1.99, 2, 3}
 		ss  = ToStrings(i64)
 	)
 
diff --git a/lib/strings/to_test.go b/lib/strings/to_test.go
index 18d971c1..11a674e0 100644
--- a/lib/strings/to_test.go
+++ b/lib/strings/to_test.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package strings
 
@@ -32,7 +32,7 @@ func TestToInt64(t *testing.T) {
 
 func TestToStrings(t *testing.T) {
 	var (
-		is  = make([]interface{}, 0)
+		is  = make([]any, 0)
 		i64 = []int64{0, 1, 2, 3}
 		exp = []string{`0`, `1`, `2`, `3`}
 
diff --git a/lib/tabula/claset.go b/lib/tabula/claset.go
index 4ea7b1f3..cc51f017 100644
--- a/lib/tabula/claset.go
+++ b/lib/tabula/claset.go
@@ -1,6 +1,6 @@
-// Copyright 2017, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// SPDX-FileCopyrightText: 2017 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tabula
 
@@ -45,7 +45,7 @@ func NewClaset(mode int, types []int, names []string) (claset *Claset) {
 }
 
 // Clone return a copy of current claset object.
-func (claset *Claset) Clone() interface{} {
+func (claset *Claset) Clone() any {
 	clone := Claset{
 		ClassIndex: claset.GetClassIndex(),
 		major:      claset.MajorityClass(),
diff --git a/lib/tabula/column.go b/lib/tabula/column.go
index 091d6ad5..d7d85483 100644
--- a/lib/tabula/column.go
+++ b/lib/tabula/column.go
@@ -1,6 +1,6 @@
-// Copyright 2017, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// SPDX-FileCopyrightText: 2017 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tabula
 
@@ -126,7 +126,7 @@ func (col *Column) SetRecords(recs *Records) {
 }
 
 // Interface return the column object as an interface.
-func (col *Column) Interface() interface{} {
+func (col *Column) Interface() any {
 	return col
 }
 
diff --git a/lib/tabula/columninterface.go b/lib/tabula/columninterface.go
index d5bb8dd3..02d9a2ce 100644
--- a/lib/tabula/columninterface.go
+++ b/lib/tabula/columninterface.go
@@ -1,6 +1,6 @@
-// Copyright 2017, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// SPDX-FileCopyrightText: 2017 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tabula
 
@@ -14,5 +14,5 @@ type ColumnInterface interface {
 
 	SetRecords(recs *Records)
 
-	Interface() interface{}
+	Interface() any
 }
diff --git a/lib/tabula/dataset.go b/lib/tabula/dataset.go
index dfcc11be..e6e87b3b 100644
--- a/lib/tabula/dataset.go
+++ b/lib/tabula/dataset.go
@@ -1,6 +1,6 @@
-// Copyright 2017, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// SPDX-FileCopyrightText: 2017 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tabula
 
@@ -68,7 +68,7 @@ func (dataset *Dataset) Init(mode int, types []int, names []string) {
 }
 
 // Clone return a copy of current dataset.
-func (dataset *Dataset) Clone() interface{} {
+func (dataset *Dataset) Clone() any {
 	clone := NewDataset(dataset.GetMode(), nil, nil)
 
 	for _, col := range dataset.Columns {
@@ -299,7 +299,7 @@ func (dataset *Dataset) SetRows(rows *Rows) {
 }
 
 // GetData return the data, based on mode (rows, columns, or matrix).
-func (dataset *Dataset) GetData() interface{} {
+func (dataset *Dataset) GetData() any {
 	switch dataset.Mode {
 	case DatasetModeRows:
 		return &dataset.Rows
diff --git a/lib/tabula/datasetinterface.go b/lib/tabula/datasetinterface.go
index 18557bba..d695fbc2 100644
--- a/lib/tabula/datasetinterface.go
+++ b/lib/tabula/datasetinterface.go
@@ -1,6 +1,6 @@
-// Copyright 2017, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// SPDX-FileCopyrightText: 2017 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tabula
 
@@ -12,7 +12,7 @@ import (
 // DatasetInterface is the interface for working with DSV data.
 type DatasetInterface interface {
 	Init(mode int, types []int, names []string)
-	Clone() interface{}
+	Clone() any
 	Reset() error
 
 	GetMode() int
@@ -42,7 +42,7 @@ type DatasetInterface interface {
 	SetRows(*Rows)
 	DeleteRow(idx int) *Row
 
-	GetData() interface{}
+	GetData() any
 	GetDataAsRows() *Rows
 	GetDataAsColumns() *Columns
 
@@ -61,7 +61,7 @@ type DatasetInterface interface {
 
 // ReadDatasetConfig open dataset configuration file and initialize dataset
 // field from there.
-func ReadDatasetConfig(ds interface{}, fcfg string) (e error) {
+func ReadDatasetConfig(ds any, fcfg string) (e error) {
 	cfg, e := os.ReadFile(fcfg)
 
 	if nil != e {
@@ -221,7 +221,7 @@ func SplitRowsByCategorical(di DatasetInterface, colidx int, splitVal []string)
 // split data using value in column `colidx`. If value is numeric it will return
 // any rows that have column value less than `value` in `splitL`, and any column
 // value greater or equal to `value` in `splitR`.
-func SplitRowsByValue(di DatasetInterface, colidx int, value interface{}) (
+func SplitRowsByValue(di DatasetInterface, colidx int, value any) (
 	splitL DatasetInterface,
 	splitR DatasetInterface,
 	e error,
diff --git a/lib/tabula/record.go b/lib/tabula/record.go
index 63a24a58..1d108e14 100644
--- a/lib/tabula/record.go
+++ b/lib/tabula/record.go
@@ -1,6 +1,6 @@
-// Copyright 2017, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// SPDX-FileCopyrightText: 2017 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tabula
 
@@ -23,7 +23,7 @@ const (
 
 // Record represent the smallest building block of data-set.
 type Record struct {
-	v interface{}
+	v any
 }
 
 // NewRecord will create and return record with nil value.
@@ -143,7 +143,7 @@ func (r *Record) IsMissingValue() bool {
 }
 
 // Interface return record value as interface.
-func (r *Record) Interface() interface{} {
+func (r *Record) Interface() any {
 	return r.v
 }
 
@@ -226,7 +226,7 @@ func (r *Record) IsEqualToString(v string) bool {
 
 // IsEqualToInterface return true if interface type and value equal to record
 // type and value.
-func (r *Record) IsEqualToInterface(v interface{}) bool {
+func (r *Record) IsEqualToInterface(v any) bool {
 	return reflect.DeepEqual(r.v, v)
 }
 
diff --git a/lib/tabula/records.go b/lib/tabula/records.go
index 592f1699..e6a4ca9d 100644
--- a/lib/tabula/records.go
+++ b/lib/tabula/records.go
@@ -1,6 +1,6 @@
-// Copyright 2017, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// SPDX-FileCopyrightText: 2017 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tabula
 
@@ -25,7 +25,7 @@ func (recs *Records) SortByIndex(sortedIdx []int) *Records {
 
 // CountWhere return number of record where its value is equal to `v` type and
 // value.
-func (recs *Records) CountWhere(v interface{}) (c int) {
+func (recs *Records) CountWhere(v any) (c int) {
 	for _, r := range *recs {
 		if r.IsEqualToInterface(v) {
 			c++
@@ -35,7 +35,7 @@ func (recs *Records) CountWhere(v interface{}) (c int) {
 }
 
 // CountsWhere will return count of each value in slice `sv`.
-func (recs *Records) CountsWhere(vs []interface{}) (counts []int) {
+func (recs *Records) CountsWhere(vs []any) (counts []int) {
 	for _, v := range vs {
 		c := recs.CountWhere(v)
 		counts = append(counts, c)
diff --git a/lib/tabula/row.go b/lib/tabula/row.go
index 99c96d7e..1e08e6fe 100644
--- a/lib/tabula/row.go
+++ b/lib/tabula/row.go
@@ -1,6 +1,6 @@
-// Copyright 2017, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// SPDX-FileCopyrightText: 2017 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package tabula
 
@@ -69,7 +69,7 @@ func (row *Row) GetRecord(i int) *Record {
 
 // GetValueAt return the value of row record at index `idx`. If the index is
 // out of range it will return nil and false
-func (row *Row) GetValueAt(idx int) (interface{}, bool) {
+func (row *Row) GetValueAt(idx int) (any, bool) {
 	if row.Len() <= idx {
 		return nil, false
 	}
diff --git a/lib/test/test.go b/lib/test/test.go
index 5a85f58a..66419a5b 100644
--- a/lib/test/test.go
+++ b/lib/test/test.go
@@ -56,7 +56,7 @@ import (
 //
 // LIMITATION: this method does not support recursive pointer, for example a
 // node that point to parent and parent that point back to node again.
-func Assert(w Writer, name string, exp, got interface{}) {
+func Assert(w Writer, name string, exp, got any) {
 	w.Helper()
 
 	var logp = `Assert`
@@ -78,7 +78,7 @@ func Assert(w Writer, name string, exp, got interface{}) {
 	}
 }
 
-func printStringDiff(w Writer, name string, exp, got interface{}) bool {
+func printStringDiff(w Writer, name string, exp, got any) bool {
 	var (
 		diffData diff.Data
 		expStr   string
diff --git a/lib/test/test_test.go b/lib/test/test_test.go
index 3fb4bdd0..90a5fa91 100644
--- a/lib/test/test_test.go
+++ b/lib/test/test_test.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package test
 
@@ -10,8 +10,8 @@ import (
 
 func TestAssert(t *testing.T) {
 	type testCase struct {
-		a    interface{}
-		b    interface{}
+		a    any
+		b    any
 		exp  string
 		desc string
 	}
@@ -19,7 +19,7 @@ func TestAssert(t *testing.T) {
 	var str = `a string`
 
 	var cases = []testCase{{
-		desc: `nil interface{}`,
+		desc: `nil any`,
 		a:    nil,
 		b:    &str,
 		exp:  `!!! Assert: IsValid: expecting <invalid Value>(false), got <*string Value>(true)`,
diff --git a/lib/websocket/clientmanager.go b/lib/websocket/clientmanager.go
index 7c1ad61e..87f97465 100644
--- a/lib/websocket/clientmanager.go
+++ b/lib/websocket/clientmanager.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package websocket
 
@@ -158,7 +158,7 @@ func (cls *ClientManager) setFrames(conn int, frames *Frames) {
 // add new socket connection to user ID in context.
 func (cls *ClientManager) add(ctx context.Context, conn int) {
 	var (
-		v     interface{}
+		v     any
 		uid   uint64
 		conns []int
 		ok    bool
@@ -195,7 +195,7 @@ func (cls *ClientManager) add(ctx context.Context, conn int) {
 func (cls *ClientManager) remove(conn int) {
 	var (
 		ctx   context.Context
-		v     interface{}
+		v     any
 		conns []int
 		ok    bool
 	)
diff --git a/lib/websocket/handshake.go b/lib/websocket/handshake.go
index 122baa46..57fd0e11 100644
--- a/lib/websocket/handshake.go
+++ b/lib/websocket/handshake.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package websocket
 
@@ -63,7 +63,7 @@ const (
 
 var (
 	_handshakePool = sync.Pool{
-		New: func() interface{} {
+		New: func() any {
 			return new(Handshake)
 		},
 	}
diff --git a/lib/websocket/request.go b/lib/websocket/request.go
index 60a44349..ad7bcb53 100644
--- a/lib/websocket/request.go
+++ b/lib/websocket/request.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package websocket
 
@@ -13,7 +13,7 @@ import (
 
 var (
 	_reqPool = sync.Pool{
-		New: func() interface{} {
+		New: func() any {
 			return new(Request)
 		},
 	}
diff --git a/lib/websocket/response.go b/lib/websocket/response.go
index 6ea65b24..48bcb020 100644
--- a/lib/websocket/response.go
+++ b/lib/websocket/response.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package websocket
 
@@ -12,7 +12,7 @@ import (
 
 var (
 	_resPool = sync.Pool{
-		New: func() interface{} {
+		New: func() any {
 			return new(Response)
 		},
 	}
diff --git a/lib/websocket/websocket.go b/lib/websocket/websocket.go
index e0e80927..9e6e994b 100644
--- a/lib/websocket/websocket.go
+++ b/lib/websocket/websocket.go
@@ -1,6 +1,6 @@
-// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2018 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package websocket
 
@@ -28,7 +28,7 @@ var (
 	defaultPingInterval = 10 * time.Second
 
 	_bbPool = sync.Pool{
-		New: func() interface{} {
+		New: func() any {
 			return new(bytes.Buffer)
 		},
 	}
diff --git a/lib/xmlrpc/request.go b/lib/xmlrpc/request.go
index 0b9dce42..b388ae11 100644
--- a/lib/xmlrpc/request.go
+++ b/lib/xmlrpc/request.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package xmlrpc
 
@@ -18,7 +18,7 @@ type Request struct {
 }
 
 // NewRequest create and initialize new request.
-func NewRequest(methodName string, params []interface{}) (req Request, err error) {
+func NewRequest(methodName string, params []any) (req Request, err error) {
 	req = Request{
 		MethodName: methodName,
 		Params:     make([]*Value, 0, len(params)),
diff --git a/lib/xmlrpc/request_test.go b/lib/xmlrpc/request_test.go
index 4f9b742d..d9d421f2 100644
--- a/lib/xmlrpc/request_test.go
+++ b/lib/xmlrpc/request_test.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package xmlrpc
 
@@ -18,17 +18,17 @@ type testStruct struct {
 func TestRequest_MarshalText(t *testing.T) {
 	type testCase struct {
 		methodName string
-		params     []interface{}
+		params     []any
 	}
 
 	var cases = []testCase{{
 		methodName: "method.name",
-		params: []interface{}{
+		params: []any{
 			"param-string",
 		},
 	}, {
 		methodName: "test.struct",
-		params: []interface{}{
+		params: []any{
 			testStruct{
 				X: 1,
 				Y: true,
@@ -36,7 +36,7 @@ func TestRequest_MarshalText(t *testing.T) {
 		},
 	}, {
 		methodName: "test.array",
-		params: []interface{}{
+		params: []any{
 			[]string{"a", "b"},
 		},
 	}}
diff --git a/lib/xmlrpc/value.go b/lib/xmlrpc/value.go
index c25ecd8d..00d6f010 100644
--- a/lib/xmlrpc/value.go
+++ b/lib/xmlrpc/value.go
@@ -1,6 +1,6 @@
-// Copyright 2020, Shulhan <ms@kilabit.info>. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+//
+// SPDX-License-Identifier: BSD-3-Clause
 
 package xmlrpc
 
@@ -16,7 +16,7 @@ type Value struct {
 	// In contains scalar value for Base64, Boolean, Double, Integer,
 	// String, and DateTime.
 	// It would be nil for Kind of Array and Struct.
-	In interface{}
+	In any
 
 	// Pair of struct member name and its value.
 	StructMembers map[string]*Value
@@ -28,7 +28,7 @@ type Value struct {
 }
 
 // NewValue convert Go type data into XML-RPC value.
-func NewValue(in interface{}) (out *Value) {
+func NewValue(in any) (out *Value) {
 	reft := reflect.TypeOf(in)
 	if reft == nil {
 		return nil