diff --git a/pgtype/aclitem.go b/pgtype/aclitem.go
deleted file mode 100644
index 0c1f23b5..00000000
--- a/pgtype/aclitem.go
+++ /dev/null
@@ -1,127 +0,0 @@
-package pgtype
-
-import (
-	"database/sql/driver"
-	"fmt"
-)
-
-// ACLItem is used for PostgreSQL's aclitem data type. A sample aclitem
-// might look like this:
-//
-//	postgres=arwdDxt/postgres
-//
-// Note, however, that because the user/role name part of an aclitem is
-// an identifier, it follows all the usual formatting rules for SQL
-// identifiers: if it contains spaces and other special characters,
-// it should appear in double-quotes:
-//
-//	postgres=arwdDxt/"role with spaces"
-//
-type ACLItem struct {
-	String string
-	Valid  bool
-}
-
-func (dst *ACLItem) Set(src interface{}) error {
-	if src == nil {
-		*dst = ACLItem{}
-		return nil
-	}
-
-	if value, ok := src.(interface{ Get() interface{} }); ok {
-		value2 := value.Get()
-		if value2 != value {
-			return dst.Set(value2)
-		}
-	}
-
-	switch value := src.(type) {
-	case string:
-		*dst = ACLItem{String: value, Valid: true}
-	case *string:
-		if value == nil {
-			*dst = ACLItem{}
-		} else {
-			*dst = ACLItem{String: *value, Valid: true}
-		}
-	default:
-		if originalSrc, ok := underlyingStringType(src); ok {
-			return dst.Set(originalSrc)
-		}
-		return fmt.Errorf("cannot convert %v to ACLItem", value)
-	}
-
-	return nil
-}
-
-func (dst ACLItem) Get() interface{} {
-	if !dst.Valid {
-		return nil
-	}
-	return dst.String
-}
-
-func (src *ACLItem) AssignTo(dst interface{}) error {
-	if !src.Valid {
-		return NullAssignTo(dst)
-	}
-
-	switch v := dst.(type) {
-	case *string:
-		*v = src.String
-		return nil
-	default:
-		if nextDst, retry := GetAssignToDstType(dst); retry {
-			return src.AssignTo(nextDst)
-		}
-		return fmt.Errorf("unable to assign to %T", dst)
-	}
-
-	return fmt.Errorf("cannot decode %#v into %T", src, dst)
-}
-
-func (dst *ACLItem) DecodeText(ci *ConnInfo, src []byte) error {
-	if src == nil {
-		*dst = ACLItem{}
-		return nil
-	}
-
-	*dst = ACLItem{String: string(src), Valid: true}
-	return nil
-}
-
-func (src ACLItem) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
-	if !src.Valid {
-		return nil, nil
-	}
-
-	return append(buf, src.String...), nil
-}
-
-// Scan implements the database/sql Scanner interface.
-func (dst *ACLItem) Scan(src interface{}) error {
-	if src == nil {
-		*dst = ACLItem{}
-		return nil
-	}
-
-	switch src := src.(type) {
-	case string:
-		return dst.DecodeText(nil, []byte(src))
-	case []byte:
-		srcCopy := make([]byte, len(src))
-		copy(srcCopy, src)
-		return dst.DecodeText(nil, srcCopy)
-	}
-
-	return fmt.Errorf("cannot scan %T", src)
-}
-
-// Value implements the database/sql/driver Valuer interface.
-func (src ACLItem) Value() (driver.Value, error) {
-	if !src.Valid {
-		return nil, nil
-	}
-
-	return src.String, nil
-}
diff --git a/pgtype/aclitem_array.go b/pgtype/aclitem_array.go
deleted file mode 100644
index fc1128b7..00000000
--- a/pgtype/aclitem_array.go
+++ /dev/null
@@ -1,418 +0,0 @@
-// Code generated by erb. DO NOT EDIT.
-
-package pgtype
-
-import (
-	"database/sql/driver"
-	"fmt"
-	"reflect"
-)
-
-type ACLItemArray struct {
-	Elements   []ACLItem
-	Dimensions []ArrayDimension
-	Valid      bool
-}
-
-func (dst *ACLItemArray) Set(src interface{}) error {
-	// untyped nil and typed nil interfaces are different
-	if src == nil {
-		*dst = ACLItemArray{}
-		return nil
-	}
-
-	if value, ok := src.(interface{ Get() interface{} }); ok {
-		value2 := value.Get()
-		if value2 != value {
-			return dst.Set(value2)
-		}
-	}
-
-	// Attempt to match to select common types:
-	switch value := src.(type) {
-
-	case []string:
-		if value == nil {
-			*dst = ACLItemArray{}
-		} else if len(value) == 0 {
-			*dst = ACLItemArray{Valid: true}
-		} else {
-			elements := make([]ACLItem, len(value))
-			for i := range value {
-				if err := elements[i].Set(value[i]); err != nil {
-					return err
-				}
-			}
-			*dst = ACLItemArray{
-				Elements:   elements,
-				Dimensions: []ArrayDimension{{Length: int32(len(elements)), LowerBound: 1}},
-				Valid:      true,
-			}
-		}
-
-	case []*string:
-		if value == nil {
-			*dst = ACLItemArray{}
-		} else if len(value) == 0 {
-			*dst = ACLItemArray{Valid: true}
-		} else {
-			elements := make([]ACLItem, len(value))
-			for i := range value {
-				if err := elements[i].Set(value[i]); err != nil {
-					return err
-				}
-			}
-			*dst = ACLItemArray{
-				Elements:   elements,
-				Dimensions: []ArrayDimension{{Length: int32(len(elements)), LowerBound: 1}},
-				Valid:      true,
-			}
-		}
-
-	case []ACLItem:
-		if value == nil {
-			*dst = ACLItemArray{}
-		} else if len(value) == 0 {
-			*dst = ACLItemArray{Valid: true}
-		} else {
-			*dst = ACLItemArray{
-				Elements:   value,
-				Dimensions: []ArrayDimension{{Length: int32(len(value)), LowerBound: 1}},
-				Valid:      true,
-			}
-		}
-	default:
-		// Fallback to reflection if an optimised match was not found.
-		// The reflection is necessary for arrays and multidimensional slices,
-		// but it comes with a 20-50% performance penalty for large arrays/slices
-		reflectedValue := reflect.ValueOf(src)
-		if !reflectedValue.IsValid() || reflectedValue.IsZero() {
-			*dst = ACLItemArray{}
-			return nil
-		}
-
-		dimensions, elementsLength, ok := findDimensionsFromValue(reflectedValue, nil, 0)
-		if !ok {
-			return fmt.Errorf("cannot find dimensions of %v for ACLItemArray", src)
-		}
-		if elementsLength == 0 {
-			*dst = ACLItemArray{Valid: true}
-			return nil
-		}
-		if len(dimensions) == 0 {
-			if originalSrc, ok := underlyingSliceType(src); ok {
-				return dst.Set(originalSrc)
-			}
-			return fmt.Errorf("cannot convert %v to ACLItemArray", src)
-		}
-
-		*dst = ACLItemArray{
-			Elements:   make([]ACLItem, elementsLength),
-			Dimensions: dimensions,
-			Valid:      true,
-		}
-		elementCount, err := dst.setRecursive(reflectedValue, 0, 0)
-		if err != nil {
-			// Maybe the target was one dimension too far, try again:
-			if len(dst.Dimensions) > 1 {
-				dst.Dimensions = dst.Dimensions[:len(dst.Dimensions)-1]
-				elementsLength = 0
-				for _, dim := range dst.Dimensions {
-					if elementsLength == 0 {
-						elementsLength = int(dim.Length)
-					} else {
-						elementsLength *= int(dim.Length)
-					}
-				}
-				dst.Elements = make([]ACLItem, elementsLength)
-				elementCount, err = dst.setRecursive(reflectedValue, 0, 0)
-				if err != nil {
-					return err
-				}
-			} else {
-				return err
-			}
-		}
-		if elementCount != len(dst.Elements) {
-			return fmt.Errorf("cannot convert %v to ACLItemArray, expected %d dst.Elements, but got %d instead", src, len(dst.Elements), elementCount)
-		}
-	}
-
-	return nil
-}
-
-func (dst *ACLItemArray) setRecursive(value reflect.Value, index, dimension int) (int, error) {
-	switch value.Kind() {
-	case reflect.Array:
-		fallthrough
-	case reflect.Slice:
-		if len(dst.Dimensions) == dimension {
-			break
-		}
-
-		valueLen := value.Len()
-		if int32(valueLen) != dst.Dimensions[dimension].Length {
-			return 0, fmt.Errorf("multidimensional arrays must have array expressions with matching dimensions")
-		}
-		for i := 0; i < valueLen; i++ {
-			var err error
-			index, err = dst.setRecursive(value.Index(i), index, dimension+1)
-			if err != nil {
-				return 0, err
-			}
-		}
-
-		return index, nil
-	}
-	if !value.CanInterface() {
-		return 0, fmt.Errorf("cannot convert all values to ACLItemArray")
-	}
-	if err := dst.Elements[index].Set(value.Interface()); err != nil {
-		return 0, fmt.Errorf("%v in ACLItemArray", err)
-	}
-	index++
-
-	return index, nil
-}
-
-func (dst ACLItemArray) Get() interface{} {
-	if !dst.Valid {
-		return nil
-	}
-	return dst
-}
-
-func (src *ACLItemArray) AssignTo(dst interface{}) error {
-	if !src.Valid {
-		return NullAssignTo(dst)
-	}
-
-	if len(src.Dimensions) <= 1 {
-		// Attempt to match to select common types:
-		switch v := dst.(type) {
-
-		case *[]string:
-			*v = make([]string, len(src.Elements))
-			for i := range src.Elements {
-				if err := src.Elements[i].AssignTo(&((*v)[i])); err != nil {
-					return err
-				}
-			}
-			return nil
-
-		case *[]*string:
-			*v = make([]*string, len(src.Elements))
-			for i := range src.Elements {
-				if err := src.Elements[i].AssignTo(&((*v)[i])); err != nil {
-					return err
-				}
-			}
-			return nil
-
-		}
-	}
-
-	// Try to convert to something AssignTo can use directly.
-	if nextDst, retry := GetAssignToDstType(dst); retry {
-		return src.AssignTo(nextDst)
-	}
-
-	// Fallback to reflection if an optimised match was not found.
-	// The reflection is necessary for arrays and multidimensional slices,
-	// but it comes with a 20-50% performance penalty for large arrays/slices
-	value := reflect.ValueOf(dst)
-	if value.Kind() == reflect.Ptr {
-		value = value.Elem()
-	}
-
-	switch value.Kind() {
-	case reflect.Array, reflect.Slice:
-	default:
-		return fmt.Errorf("cannot assign %T to %T", src, dst)
-	}
-
-	if len(src.Elements) == 0 {
-		if value.Kind() == reflect.Slice {
-			value.Set(reflect.MakeSlice(value.Type(), 0, 0))
-			return nil
-		}
-	}
-
-	elementCount, err := src.assignToRecursive(value, 0, 0)
-	if err != nil {
-		return err
-	}
-	if elementCount != len(src.Elements) {
-		return fmt.Errorf("cannot assign %v, needed to assign %d elements, but only assigned %d", dst, len(src.Elements), elementCount)
-	}
-
-	return nil
-}
-
-func (src *ACLItemArray) assignToRecursive(value reflect.Value, index, dimension int) (int, error) {
-	switch kind := value.Kind(); kind {
-	case reflect.Array:
-		fallthrough
-	case reflect.Slice:
-		if len(src.Dimensions) == dimension {
-			break
-		}
-
-		length := int(src.Dimensions[dimension].Length)
-		if reflect.Array == kind {
-			typ := value.Type()
-			if typ.Len() != length {
-				return 0, fmt.Errorf("expected size %d array, but %s has size %d array", length, typ, typ.Len())
-			}
-			value.Set(reflect.New(typ).Elem())
-		} else {
-			value.Set(reflect.MakeSlice(value.Type(), length, length))
-		}
-
-		var err error
-		for i := 0; i < length; i++ {
-			index, err = src.assignToRecursive(value.Index(i), index, dimension+1)
-			if err != nil {
-				return 0, err
-			}
-		}
-
-		return index, nil
-	}
-	if len(src.Dimensions) != dimension {
-		return 0, fmt.Errorf("incorrect dimensions, expected %d, found %d", len(src.Dimensions), dimension)
-	}
-	if !value.CanAddr() {
-		return 0, fmt.Errorf("cannot assign all values from ACLItemArray")
-	}
-	addr := value.Addr()
-	if !addr.CanInterface() {
-		return 0, fmt.Errorf("cannot assign all values from ACLItemArray")
-	}
-	if err := src.Elements[index].AssignTo(addr.Interface()); err != nil {
-		return 0, err
-	}
-	index++
-	return index, nil
-}
-
-func (dst *ACLItemArray) DecodeText(ci *ConnInfo, src []byte) error {
-	if src == nil {
-		*dst = ACLItemArray{}
-		return nil
-	}
-
-	uta, err := ParseUntypedTextArray(string(src))
-	if err != nil {
-		return err
-	}
-
-	var elements []ACLItem
-
-	if len(uta.Elements) > 0 {
-		elements = make([]ACLItem, len(uta.Elements))
-
-		for i, s := range uta.Elements {
-			var elem ACLItem
-			var elemSrc []byte
-			if s != "NULL" || uta.Quoted[i] {
-				elemSrc = []byte(s)
-			}
-			err = elem.DecodeText(ci, elemSrc)
-			if err != nil {
-				return err
-			}
-
-			elements[i] = elem
-		}
-	}
-
-	*dst = ACLItemArray{Elements: elements, Dimensions: uta.Dimensions, Valid: true}
-
-	return nil
-}
-
-func (src ACLItemArray) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
-	if !src.Valid {
-		return nil, nil
-	}
-
-	if len(src.Dimensions) == 0 {
-		return append(buf, '{', '}'), nil
-	}
-
-	buf = EncodeTextArrayDimensions(buf, src.Dimensions)
-
-	// dimElemCounts is the multiples of elements that each array lies on. For
-	// example, a single dimension array of length 4 would have a dimElemCounts of
-	// [4]. A multi-dimensional array of lengths [3,5,2] would have a
-	// dimElemCounts of [30,10,2]. This is used to simplify when to render a '{'
-	// or '}'.
-	dimElemCounts := make([]int, len(src.Dimensions))
-	dimElemCounts[len(src.Dimensions)-1] = int(src.Dimensions[len(src.Dimensions)-1].Length)
-	for i := len(src.Dimensions) - 2; i > -1; i-- {
-		dimElemCounts[i] = int(src.Dimensions[i].Length) * dimElemCounts[i+1]
-	}
-
-	inElemBuf := make([]byte, 0, 32)
-	for i, elem := range src.Elements {
-		if i > 0 {
-			buf = append(buf, ',')
-		}
-
-		for _, dec := range dimElemCounts {
-			if i%dec == 0 {
-				buf = append(buf, '{')
-			}
-		}
-
-		elemBuf, err := elem.EncodeText(ci, inElemBuf)
-		if err != nil {
-			return nil, err
-		}
-		if elemBuf == nil {
-			buf = append(buf, `NULL`...)
-		} else {
-			buf = append(buf, QuoteArrayElementIfNeeded(string(elemBuf))...)
-		}
-
-		for _, dec := range dimElemCounts {
-			if (i+1)%dec == 0 {
-				buf = append(buf, '}')
-			}
-		}
-	}
-
-	return buf, nil
-}
-
-// Scan implements the database/sql Scanner interface.
-func (dst *ACLItemArray) Scan(src interface{}) error {
-	if src == nil {
-		return dst.DecodeText(nil, nil)
-	}
-
-	switch src := src.(type) {
-	case string:
-		return dst.DecodeText(nil, []byte(src))
-	case []byte:
-		srcCopy := make([]byte, len(src))
-		copy(srcCopy, src)
-		return dst.DecodeText(nil, srcCopy)
-	}
-
-	return fmt.Errorf("cannot scan %T", src)
-}
-
-// Value implements the database/sql/driver Valuer interface.
-func (src ACLItemArray) Value() (driver.Value, error) {
-	buf, err := src.EncodeText(nil, nil)
-	if err != nil {
-		return nil, err
-	}
-	if buf == nil {
-		return nil, nil
-	}
-
-	return string(buf), nil
-}
diff --git a/pgtype/aclitem_array_test.go b/pgtype/aclitem_array_test.go
deleted file mode 100644
index bdae9b56..00000000
--- a/pgtype/aclitem_array_test.go
+++ /dev/null
@@ -1,329 +0,0 @@
-package pgtype_test
-
-import (
-	"reflect"
-	"testing"
-
-	"github.com/jackc/pgx/v5/pgtype"
-	"github.com/jackc/pgx/v5/pgtype/testutil"
-)
-
-func TestACLItemArrayTranscode(t *testing.T) {
-	testutil.TestSuccessfulTranscode(t, "aclitem[]", []interface{}{
-		&pgtype.ACLItemArray{
-			Elements:   nil,
-			Dimensions: nil,
-			Valid:      true,
-		},
-		&pgtype.ACLItemArray{
-			Elements: []pgtype.ACLItem{
-				{String: "=r/postgres", Valid: true},
-				{},
-			},
-			Dimensions: []pgtype.ArrayDimension{{Length: 2, LowerBound: 1}},
-			Valid:      true,
-		},
-		&pgtype.ACLItemArray{},
-		&pgtype.ACLItemArray{
-			Elements: []pgtype.ACLItem{
-				{String: "=r/postgres", Valid: true},
-				{String: "postgres=arwdDxt/postgres", Valid: true},
-				//{String: `postgres=arwdDxt/" tricky, ' } "" \ test user "`, Valid: true},
-				{String: `postgres=arwdDxt/postgres`, Valid: true}, // todo: remove after fixing above case
-				{String: "=r/postgres", Valid: true},
-				{},
-				{String: "=r/postgres", Valid: true},
-			},
-			Dimensions: []pgtype.ArrayDimension{{Length: 3, LowerBound: 1}, {Length: 2, LowerBound: 1}},
-			Valid:      true,
-		},
-		&pgtype.ACLItemArray{
-			Elements: []pgtype.ACLItem{
-				{String: "=r/postgres", Valid: true},
-				{String: "postgres=arwdDxt/postgres", Valid: true},
-				{String: "=r/postgres", Valid: true},
-				{String: "postgres=arwdDxt/postgres", Valid: true},
-			},
-			Dimensions: []pgtype.ArrayDimension{
-				{Length: 2, LowerBound: 4},
-				{Length: 2, LowerBound: 2},
-			},
-			Valid: true,
-		},
-	})
-}
-
-func TestACLItemArraySet(t *testing.T) {
-	successfulTests := []struct {
-		source interface{}
-		result pgtype.ACLItemArray
-	}{
-		{
-			source: []string{"=r/postgres"},
-			result: pgtype.ACLItemArray{
-				Elements:   []pgtype.ACLItem{{String: "=r/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
-				Valid:      true},
-		},
-		{
-			source: (([]string)(nil)),
-			result: pgtype.ACLItemArray{},
-		},
-		{
-			source: [][]string{{"=r/postgres"}, {"postgres=arwdDxt/postgres"}},
-			result: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-		},
-		{
-			source: [][][][]string{
-				{{{
-					"=r/postgres",
-					"postgres=arwdDxt/postgres",
-					"=r/postgres"}}},
-				{{{
-					"postgres=arwdDxt/postgres",
-					"=r/postgres",
-					"postgres=arwdDxt/postgres"}}}},
-			result: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true},
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true},
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{
-					{LowerBound: 1, Length: 2},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 3}},
-				Valid: true},
-		},
-		{
-			source: [2][1]string{{"=r/postgres"}, {"postgres=arwdDxt/postgres"}},
-			result: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-		},
-		{
-			source: [2][1][1][3]string{
-				{{{
-					"=r/postgres",
-					"postgres=arwdDxt/postgres",
-					"=r/postgres"}}},
-				{{{
-					"postgres=arwdDxt/postgres",
-					"=r/postgres",
-					"postgres=arwdDxt/postgres"}}}},
-			result: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true},
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true},
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{
-					{LowerBound: 1, Length: 2},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 3}},
-				Valid: true},
-		},
-	}
-
-	for i, tt := range successfulTests {
-		var r pgtype.ACLItemArray
-		err := r.Set(tt.source)
-		if err != nil {
-			t.Errorf("%d: %v", i, err)
-		}
-
-		if !reflect.DeepEqual(r, tt.result) {
-			t.Errorf("%d: expected %v to convert to %v, but it was %v", i, tt.source, tt.result, r)
-		}
-	}
-}
-
-func TestACLItemArrayAssignTo(t *testing.T) {
-	var stringSlice []string
-	type _stringSlice []string
-	var namedStringSlice _stringSlice
-	var stringSliceDim2 [][]string
-	var stringSliceDim4 [][][][]string
-	var stringArrayDim2 [2][1]string
-	var stringArrayDim4 [2][1][1][3]string
-
-	simpleTests := []struct {
-		src      pgtype.ACLItemArray
-		dst      interface{}
-		expected interface{}
-	}{
-		{
-			src: pgtype.ACLItemArray{
-				Elements:   []pgtype.ACLItem{{String: "=r/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
-				Valid:      true,
-			},
-			dst:      &stringSlice,
-			expected: []string{"=r/postgres"},
-		},
-		{
-			src: pgtype.ACLItemArray{
-				Elements:   []pgtype.ACLItem{{String: "=r/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
-				Valid:      true,
-			},
-			dst:      &namedStringSlice,
-			expected: _stringSlice{"=r/postgres"},
-		},
-		{
-			src:      pgtype.ACLItemArray{},
-			dst:      &stringSlice,
-			expected: (([]string)(nil)),
-		},
-		{
-			src:      pgtype.ACLItemArray{Valid: true},
-			dst:      &stringSlice,
-			expected: []string{},
-		},
-		{
-			src: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-			dst:      &stringSliceDim2,
-			expected: [][]string{{"=r/postgres"}, {"postgres=arwdDxt/postgres"}},
-		},
-		{
-			src: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true},
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true},
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{
-					{LowerBound: 1, Length: 2},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 3}},
-				Valid: true},
-			dst: &stringSliceDim4,
-			expected: [][][][]string{
-				{{{
-					"=r/postgres",
-					"postgres=arwdDxt/postgres",
-					"=r/postgres"}}},
-				{{{
-					"postgres=arwdDxt/postgres",
-					"=r/postgres",
-					"postgres=arwdDxt/postgres"}}}},
-		},
-		{
-			src: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-			dst:      &stringArrayDim2,
-			expected: [2][1]string{{"=r/postgres"}, {"postgres=arwdDxt/postgres"}},
-		},
-		{
-			src: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true},
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true},
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{
-					{LowerBound: 1, Length: 2},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 3}},
-				Valid: true},
-			dst: &stringArrayDim4,
-			expected: [2][1][1][3]string{
-				{{{
-					"=r/postgres",
-					"postgres=arwdDxt/postgres",
-					"=r/postgres"}}},
-				{{{
-					"postgres=arwdDxt/postgres",
-					"=r/postgres",
-					"postgres=arwdDxt/postgres"}}}},
-		},
-	}
-
-	for i, tt := range simpleTests {
-		err := tt.src.AssignTo(tt.dst)
-		if err != nil {
-			t.Errorf("%d: %v", i, err)
-		}
-
-		if dst := reflect.ValueOf(tt.dst).Elem().Interface(); !reflect.DeepEqual(dst, tt.expected) {
-			t.Errorf("%d: expected %v to assign %v, but result was %v", i, tt.src, tt.expected, dst)
-		}
-	}
-
-	errorTests := []struct {
-		src pgtype.ACLItemArray
-		dst interface{}
-	}{
-		{
-			src: pgtype.ACLItemArray{
-				Elements:   []pgtype.ACLItem{{}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
-				Valid:      true,
-			},
-			dst: &stringSlice,
-		},
-		{
-			src: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}, {LowerBound: 1, Length: 2}},
-				Valid:      true},
-			dst: &stringArrayDim2,
-		},
-		{
-			src: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}, {LowerBound: 1, Length: 2}},
-				Valid:      true},
-			dst: &stringSlice,
-		},
-		{
-			src: pgtype.ACLItemArray{
-				Elements: []pgtype.ACLItem{
-					{String: "=r/postgres", Valid: true},
-					{String: "postgres=arwdDxt/postgres", Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-			dst: &stringArrayDim4,
-		},
-	}
-
-	for i, tt := range errorTests {
-		err := tt.src.AssignTo(tt.dst)
-		if err == nil {
-			t.Errorf("%d: expected error but none was returned (%v -> %v)", i, tt.src, tt.dst)
-		}
-	}
-}
diff --git a/pgtype/aclitem_test.go b/pgtype/aclitem_test.go
deleted file mode 100644
index 84388142..00000000
--- a/pgtype/aclitem_test.go
+++ /dev/null
@@ -1,97 +0,0 @@
-package pgtype_test
-
-import (
-	"reflect"
-	"testing"
-
-	"github.com/jackc/pgx/v5/pgtype"
-	"github.com/jackc/pgx/v5/pgtype/testutil"
-)
-
-func TestACLItemTranscode(t *testing.T) {
-	testutil.TestSuccessfulTranscode(t, "aclitem", []interface{}{
-		&pgtype.ACLItem{String: "postgres=arwdDxt/postgres", Valid: true},
-		//&pgtype.ACLItem{String: `postgres=arwdDxt/" tricky, ' } "" \ test user "`, Valid: true},
-		&pgtype.ACLItem{},
-	})
-}
-
-func TestACLItemSet(t *testing.T) {
-	successfulTests := []struct {
-		source interface{}
-		result pgtype.ACLItem
-	}{
-		{source: "postgres=arwdDxt/postgres", result: pgtype.ACLItem{String: "postgres=arwdDxt/postgres", Valid: true}},
-		{source: (*string)(nil), result: pgtype.ACLItem{}},
-	}
-
-	for i, tt := range successfulTests {
-		var d pgtype.ACLItem
-		err := d.Set(tt.source)
-		if err != nil {
-			t.Errorf("%d: %v", i, err)
-		}
-
-		if d != tt.result {
-			t.Errorf("%d: expected %v to convert to %v, but it was %v", i, tt.source, tt.result, d)
-		}
-	}
-}
-
-func TestACLItemAssignTo(t *testing.T) {
-	var s string
-	var ps *string
-
-	simpleTests := []struct {
-		src      pgtype.ACLItem
-		dst      interface{}
-		expected interface{}
-	}{
-		{src: pgtype.ACLItem{String: "postgres=arwdDxt/postgres", Valid: true}, dst: &s, expected: "postgres=arwdDxt/postgres"},
-		{src: pgtype.ACLItem{}, dst: &ps, expected: ((*string)(nil))},
-	}
-
-	for i, tt := range simpleTests {
-		err := tt.src.AssignTo(tt.dst)
-		if err != nil {
-			t.Errorf("%d: %v", i, err)
-		}
-
-		if dst := reflect.ValueOf(tt.dst).Elem().Interface(); dst != tt.expected {
-			t.Errorf("%d: expected %v to assign %v, but result was %v", i, tt.src, tt.expected, dst)
-		}
-	}
-
-	pointerAllocTests := []struct {
-		src      pgtype.ACLItem
-		dst      interface{}
-		expected interface{}
-	}{
-		{src: pgtype.ACLItem{String: "postgres=arwdDxt/postgres", Valid: true}, dst: &ps, expected: "postgres=arwdDxt/postgres"},
-	}
-
-	for i, tt := range pointerAllocTests {
-		err := tt.src.AssignTo(tt.dst)
-		if err != nil {
-			t.Errorf("%d: %v", i, err)
-		}
-
-		if dst := reflect.ValueOf(tt.dst).Elem().Elem().Interface(); dst != tt.expected {
-			t.Errorf("%d: expected %v to assign %v, but result was %v", i, tt.src, tt.expected, dst)
-		}
-	}
-
-	errorTests := []struct {
-		src pgtype.ACLItem
-		dst interface{}
-	}{
-		{src: pgtype.ACLItem{}, dst: &s},
-	}
-
-	for i, tt := range errorTests {
-		err := tt.src.AssignTo(tt.dst)
-		if err == nil {
-			t.Errorf("%d: expected error but none was returned (%v -> %v)", i, tt.src, tt.dst)
-		}
-	}
-}
diff --git a/pgtype/pgtype.go b/pgtype/pgtype.go
index 6ead989e..d4001392 100644
--- a/pgtype/pgtype.go
+++ b/pgtype/pgtype.go
@@ -253,7 +253,7 @@ func newConnInfo() *ConnInfo {
 func NewConnInfo() *ConnInfo {
 	ci := newConnInfo()
 
-	ci.RegisterDataType(DataType{Value: &ACLItemArray{}, Name: "_aclitem", OID: ACLItemArrayOID})
+	ci.RegisterDataType(DataType{Name: "_aclitem", OID: ACLItemArrayOID, Codec: &ArrayCodec{ElementCodec: &TextFormatOnlyCodec{TextCodec{}}, ElementOID: ACLItemOID}})
 	ci.RegisterDataType(DataType{Name: "_bool", OID: BoolArrayOID, Codec: &ArrayCodec{ElementCodec: BoolCodec{}, ElementOID: BoolOID}})
 	ci.RegisterDataType(DataType{Name: "_bpchar", OID: BPCharArrayOID, Codec: &ArrayCodec{ElementCodec: TextCodec{}, ElementOID: BPCharOID}})
 	ci.RegisterDataType(DataType{Value: &ByteaArray{}, Name: "_bytea", OID: ByteaArrayOID})
@@ -275,7 +275,7 @@ func NewConnInfo() *ConnInfo {
 	ci.RegisterDataType(DataType{Value: &TimestamptzArray{}, Name: "_timestamptz", OID: TimestamptzArrayOID})
 	ci.RegisterDataType(DataType{Value: &UUIDArray{}, Name: "_uuid", OID: UUIDArrayOID})
 	ci.RegisterDataType(DataType{Name: "_varchar", OID: VarcharArrayOID, Codec: &ArrayCodec{ElementCodec: TextCodec{}, ElementOID: VarcharOID}})
-	ci.RegisterDataType(DataType{Value: &ACLItem{}, Name: "aclitem", OID: ACLItemOID})
+	ci.RegisterDataType(DataType{Name: "aclitem", OID: ACLItemOID, Codec: &TextFormatOnlyCodec{TextCodec{}}})
 	ci.RegisterDataType(DataType{Value: &Bit{}, Name: "bit", OID: BitOID})
 	ci.RegisterDataType(DataType{Name: "bool", OID: BoolOID, Codec: BoolCodec{}})
 	ci.RegisterDataType(DataType{Name: "box", OID: BoxOID, Codec: BoxCodec{}})
diff --git a/pgtype/pgtype_test.go b/pgtype/pgtype_test.go
index 56064281..703e1843 100644
--- a/pgtype/pgtype_test.go
+++ b/pgtype/pgtype_test.go
@@ -308,11 +308,6 @@ func testPgxCodec(t testing.TB, pgTypeName string, tests []PgxTranscodeTestCase)
 	conn := testutil.MustConnectPgx(t)
 	defer testutil.MustCloseContext(t, conn)
 
-	_, err := conn.Prepare(context.Background(), "test", fmt.Sprintf("select $1::%s", pgTypeName))
-	if err != nil {
-		t.Fatal(err)
-	}
-
 	formats := []struct {
 		name string
 		code int16
@@ -321,21 +316,30 @@ func testPgxCodec(t testing.TB, pgTypeName string, tests []PgxTranscodeTestCase)
 		{name: "BinaryFormat", code: pgx.BinaryFormatCode},
 	}
 
+	for _, format := range formats {
+		testPgxCodecFormat(t, pgTypeName, tests, conn, format.name, format.code)
+	}
+}
+
+func testPgxCodecFormat(t testing.TB, pgTypeName string, tests []PgxTranscodeTestCase, conn *pgx.Conn, formatName string, formatCode int16) {
+	_, err := conn.Prepare(context.Background(), "test", fmt.Sprintf("select $1::%s", pgTypeName))
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	for i, tt := range tests {
-		for _, format := range formats {
-			err := conn.QueryRow(context.Background(), "test", pgx.QueryResultFormats{format.code}, tt.src).Scan(tt.dst)
-			if err != nil {
-				t.Errorf("%s %d: %v", format.name, i, err)
-			}
+		err := conn.QueryRow(context.Background(), "test", pgx.QueryResultFormats{formatCode}, tt.src).Scan(tt.dst)
+		if err != nil {
+			t.Errorf("%s %d: %v", formatName, i, err)
+		}
 
-			dst := reflect.ValueOf(tt.dst)
-			if dst.Kind() == reflect.Ptr {
-				dst = dst.Elem()
-			}
+		dst := reflect.ValueOf(tt.dst)
+		if dst.Kind() == reflect.Ptr {
+			dst = dst.Elem()
+		}
 
-			if !tt.test(dst.Interface()) {
-				t.Errorf("%s %d: unexpected result for %v: %v", format.name, i, tt.src, dst.Interface())
-			}
+		if !tt.test(dst.Interface()) {
+			t.Errorf("%s %d: unexpected result for %v: %v", formatName, i, tt.src, dst.Interface())
 		}
 	}
 }
diff --git a/pgtype/text_format_only_codec.go b/pgtype/text_format_only_codec.go
new file mode 100644
index 00000000..d5e4cdb3
--- /dev/null
+++ b/pgtype/text_format_only_codec.go
@@ -0,0 +1,13 @@
+package pgtype
+
+type TextFormatOnlyCodec struct {
+	Codec
+}
+
+func (c *TextFormatOnlyCodec) FormatSupported(format int16) bool {
+	return format == TextFormatCode && c.Codec.FormatSupported(format)
+}
+
+func (TextFormatOnlyCodec) PreferredFormat() int16 {
+	return TextFormatCode
+}
diff --git a/pgtype/text_test.go b/pgtype/text_test.go
index 148aa97b..27b01c15 100644
--- a/pgtype/text_test.go
+++ b/pgtype/text_test.go
@@ -1,9 +1,12 @@
 package pgtype_test
 
 import (
+	"context"
 	"testing"
 
 	"github.com/jackc/pgx/v5/pgtype"
+	"github.com/jackc/pgx/v5/pgtype/testutil"
+	"github.com/stretchr/testify/require"
 )
 
 func TestTextCodec(t *testing.T) {
@@ -68,6 +71,60 @@ func TestTextCodecBPChar(t *testing.T) {
 	})
 }
 
+// ACLItem is used for PostgreSQL's aclitem data type. A sample aclitem
+// might look like this:
+//
+//	postgres=arwdDxt/postgres
+//
+// Note, however, that because the user/role name part of an aclitem is
+// an identifier, it follows all the usual formatting rules for SQL
+// identifiers: if it contains spaces and other special characters,
+// it should appear in double-quotes:
+//
+//	postgres=arwdDxt/"role with spaces"
+//
+// It only supports the text format.
+func TestTextCodecACLItem(t *testing.T) {
+	conn := testutil.MustConnectPgx(t)
+	defer testutil.MustCloseContext(t, conn)
+
+	testPgxCodecFormat(t, "aclitem", []PgxTranscodeTestCase{
+		{
+			pgtype.Text{String: "postgres=arwdDxt/postgres", Valid: true},
+			new(pgtype.Text),
+			isExpectedEq(pgtype.Text{String: "postgres=arwdDxt/postgres", Valid: true}),
+		},
+		{pgtype.Text{}, new(pgtype.Text), isExpectedEq(pgtype.Text{})},
+		{nil, new(pgtype.Text), isExpectedEq(pgtype.Text{})},
+	}, conn, "Text", pgtype.TextFormatCode)
+}
+
+func TestTextCodecACLItemRoleWithSpecialCharacters(t *testing.T) {
+	conn := testutil.MustConnectPgx(t)
+	defer testutil.MustCloseContext(t, conn)
+
+	ctx := context.Background()
+
+	// The tricky test user, below, has to actually exist so that it can be used in a test
+	// of aclitem formatting. It turns out aclitems cannot contain non-existing users/roles.
+	roleWithSpecialCharacters := ` tricky, ' } " \ test user `
+
+	commandTag, err := conn.Exec(ctx, `select * from pg_roles where rolname = $1`, roleWithSpecialCharacters)
+	require.NoError(t, err)
+
+	if commandTag.RowsAffected() == 0 {
+		t.Skipf("Role with special characters does not exist.")
+	}
+
+	testPgxCodecFormat(t, "aclitem", []PgxTranscodeTestCase{
+		{
+			pgtype.Text{String: `postgres=arwdDxt/" tricky, ' } "" \ test user "`, Valid: true},
+			new(pgtype.Text),
+			isExpectedEq(pgtype.Text{String: `postgres=arwdDxt/" tricky, ' } "" \ test user "`, Valid: true}),
+		},
+	}, conn, "Text", pgtype.TextFormatCode)
+}
+
 func TestTextMarshalJSON(t *testing.T) {
 	successfulTests := []struct {
 		source pgtype.Text