diff --git a/pgtype/bool.go b/pgtype/bool.go
index 4fcc67e3..4b6fbaf2 100644
--- a/pgtype/bool.go
+++ b/pgtype/bool.go
@@ -7,136 +7,27 @@ import (
 	"strconv"
 )
 
+type BoolScanner interface {
+	ScanBool(v bool, valid bool) error
+}
+
 type Bool struct {
 	Bool  bool
 	Valid bool
 }
 
-func (dst *Bool) Set(src interface{}) error {
-	if src == nil {
+// ScanBool implements the BoolScanner interface.
+func (dst *Bool) ScanBool(v bool, valid bool) error {
+	if !valid {
 		*dst = Bool{}
 		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 bool:
-		*dst = Bool{Bool: value, Valid: true}
-	case string:
-		bb, err := strconv.ParseBool(value)
-		if err != nil {
-			return err
-		}
-		*dst = Bool{Bool: bb, Valid: true}
-	case *bool:
-		if value == nil {
-			*dst = Bool{}
-		} else {
-			return dst.Set(*value)
-		}
-	case *string:
-		if value == nil {
-			*dst = Bool{}
-		} else {
-			return dst.Set(*value)
-		}
-	default:
-		if originalSrc, ok := underlyingBoolType(src); ok {
-			return dst.Set(originalSrc)
-		}
-		return fmt.Errorf("cannot convert %v to Bool", value)
-	}
+	*dst = Bool{Bool: v, Valid: true}
 
 	return nil
 }
 
-func (dst Bool) Get() interface{} {
-	if !dst.Valid {
-		return nil
-	}
-
-	return dst.Bool
-}
-
-func (src *Bool) AssignTo(dst interface{}) error {
-	if !src.Valid {
-		return NullAssignTo(dst)
-	}
-
-	switch v := dst.(type) {
-	case *bool:
-		*v = src.Bool
-		return nil
-	default:
-		if nextDst, retry := GetAssignToDstType(dst); retry {
-			return src.AssignTo(nextDst)
-		}
-		return fmt.Errorf("unable to assign to %T", dst)
-	}
-}
-
-func (dst *Bool) DecodeText(ci *ConnInfo, src []byte) error {
-	if src == nil {
-		*dst = Bool{}
-		return nil
-	}
-
-	if len(src) != 1 {
-		return fmt.Errorf("invalid length for bool: %v", len(src))
-	}
-
-	*dst = Bool{Bool: src[0] == 't', Valid: true}
-	return nil
-}
-
-func (dst *Bool) DecodeBinary(ci *ConnInfo, src []byte) error {
-	if src == nil {
-		*dst = Bool{}
-		return nil
-	}
-
-	if len(src) != 1 {
-		return fmt.Errorf("invalid length for bool: %v", len(src))
-	}
-
-	*dst = Bool{Bool: src[0] == 1, Valid: true}
-	return nil
-}
-
-func (src Bool) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
-	if !src.Valid {
-		return nil, nil
-	}
-
-	if src.Bool {
-		buf = append(buf, 't')
-	} else {
-		buf = append(buf, 'f')
-	}
-
-	return buf, nil
-}
-
-func (src Bool) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
-	if !src.Valid {
-		return nil, nil
-	}
-
-	if src.Bool {
-		buf = append(buf, 1)
-	} else {
-		buf = append(buf, 0)
-	}
-
-	return buf, nil
-}
-
 // Scan implements the database/sql Scanner interface.
 func (dst *Bool) Scan(src interface{}) error {
 	if src == nil {
@@ -149,11 +40,19 @@ func (dst *Bool) Scan(src interface{}) error {
 		*dst = Bool{Bool: src, Valid: true}
 		return nil
 	case string:
-		return dst.DecodeText(nil, []byte(src))
+		b, err := strconv.ParseBool(src)
+		if err != nil {
+			return err
+		}
+		*dst = Bool{Bool: b, Valid: true}
+		return nil
 	case []byte:
-		srcCopy := make([]byte, len(src))
-		copy(srcCopy, src)
-		return dst.DecodeText(nil, srcCopy)
+		b, err := strconv.ParseBool(string(src))
+		if err != nil {
+			return err
+		}
+		*dst = Bool{Bool: b, Valid: true}
+		return nil
 	}
 
 	return fmt.Errorf("cannot scan %T", src)
@@ -195,3 +94,204 @@ func (dst *Bool) UnmarshalJSON(b []byte) error {
 
 	return nil
 }
+
+type BoolCodec struct{}
+
+func (BoolCodec) FormatSupported(format int16) bool {
+	return format == TextFormatCode || format == BinaryFormatCode
+}
+
+func (BoolCodec) PreferredFormat() int16 {
+	return BinaryFormatCode
+}
+
+func (BoolCodec) Encode(ci *ConnInfo, oid uint32, format int16, value interface{}, buf []byte) (newBuf []byte, err error) {
+	v, valid, err := convertToBoolForEncode(value)
+	if err != nil {
+		return nil, fmt.Errorf("cannot convert %v to bool: %v", value, err)
+	}
+	if !valid {
+		return nil, nil
+	}
+	if value == nil {
+		return nil, nil
+	}
+
+	switch format {
+	case BinaryFormatCode:
+		if v {
+			buf = append(buf, 1)
+		} else {
+			buf = append(buf, 0)
+		}
+		return buf, nil
+	case TextFormatCode:
+		if v {
+			buf = append(buf, 't')
+		} else {
+			buf = append(buf, 'f')
+		}
+		return buf, nil
+	default:
+		return nil, fmt.Errorf("unknown format code: %v", format)
+	}
+}
+
+func (BoolCodec) PlanScan(ci *ConnInfo, oid uint32, format int16, target interface{}, actualTarget bool) ScanPlan {
+
+	switch format {
+	case BinaryFormatCode:
+		switch target.(type) {
+		case *bool:
+			return scanPlanBinaryBoolToBool{}
+		case BoolScanner:
+			return scanPlanBinaryBoolToBoolScanner{}
+		}
+	case TextFormatCode:
+		switch target.(type) {
+		case *bool:
+			return scanPlanTextAnyToBool{}
+		case BoolScanner:
+			return scanPlanTextAnyToBoolScanner{}
+		}
+	}
+
+	return nil
+}
+
+func (c BoolCodec) DecodeDatabaseSQLValue(ci *ConnInfo, oid uint32, format int16, src []byte) (driver.Value, error) {
+	return c.DecodeValue(ci, oid, format, src)
+}
+
+func (c BoolCodec) DecodeValue(ci *ConnInfo, oid uint32, format int16, src []byte) (interface{}, error) {
+	if src == nil {
+		return nil, nil
+	}
+
+	var b bool
+	scanPlan := c.PlanScan(ci, oid, format, &b, true)
+	if scanPlan == nil {
+		return nil, fmt.Errorf("PlanScan did not find a plan")
+	}
+	err := scanPlan.Scan(ci, oid, format, src, &b)
+	if err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+func convertToBoolForEncode(v interface{}) (b bool, valid bool, err error) {
+	if v == nil {
+		return false, false, nil
+	}
+
+	switch v := v.(type) {
+	case bool:
+		return v, true, nil
+	case *bool:
+		if v == nil {
+			return false, false, nil
+		}
+		return *v, true, nil
+	case string:
+		bb, err := strconv.ParseBool(v)
+		if err != nil {
+			return false, false, err
+		}
+		return bb, true, nil
+	case *string:
+		if v == nil {
+			return false, false, nil
+		}
+		bb, err := strconv.ParseBool(*v)
+		if err != nil {
+			return false, false, err
+		}
+		return bb, true, nil
+	default:
+		if originalvalue, ok := underlyingBoolType(v); ok {
+			return convertToBoolForEncode(originalvalue)
+		}
+		return false, false, fmt.Errorf("cannot convert %v to bool", v)
+	}
+}
+
+type scanPlanBinaryBoolToBool struct{}
+
+func (scanPlanBinaryBoolToBool) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
+	if src == nil {
+		return fmt.Errorf("cannot scan null into %T", dst)
+	}
+
+	if len(src) != 1 {
+		return fmt.Errorf("invalid length for bool: %v", len(src))
+	}
+
+	p, ok := (dst).(*bool)
+	if !ok {
+		return ErrScanTargetTypeChanged
+	}
+
+	*p = src[0] == 1
+
+	return nil
+}
+
+type scanPlanTextAnyToBool struct{}
+
+func (scanPlanTextAnyToBool) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
+	if src == nil {
+		return fmt.Errorf("cannot scan null into %T", dst)
+	}
+
+	if len(src) != 1 {
+		return fmt.Errorf("invalid length for bool: %v", len(src))
+	}
+
+	p, ok := (dst).(*bool)
+	if !ok {
+		return ErrScanTargetTypeChanged
+	}
+
+	*p = src[0] == 't'
+
+	return nil
+}
+
+type scanPlanBinaryBoolToBoolScanner struct{}
+
+func (scanPlanBinaryBoolToBoolScanner) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
+	s, ok := (dst).(BoolScanner)
+	if !ok {
+		return ErrScanTargetTypeChanged
+	}
+
+	if src == nil {
+		return s.ScanBool(false, false)
+	}
+
+	if len(src) != 1 {
+		return fmt.Errorf("invalid length for bool: %v", len(src))
+	}
+
+	return s.ScanBool(src[0] == 1, true)
+}
+
+type scanPlanTextAnyToBoolScanner struct{}
+
+func (scanPlanTextAnyToBoolScanner) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
+	s, ok := (dst).(BoolScanner)
+	if !ok {
+		return ErrScanTargetTypeChanged
+	}
+
+	if src == nil {
+		return s.ScanBool(false, false)
+	}
+
+	if len(src) != 1 {
+		return fmt.Errorf("invalid length for bool: %v", len(src))
+	}
+
+	return s.ScanBool(src[0] == 't', true)
+}
diff --git a/pgtype/bool_array.go b/pgtype/bool_array.go
deleted file mode 100644
index a282fd6b..00000000
--- a/pgtype/bool_array.go
+++ /dev/null
@@ -1,504 +0,0 @@
-// Code generated by erb. DO NOT EDIT.
-
-package pgtype
-
-import (
-	"database/sql/driver"
-	"encoding/binary"
-	"fmt"
-	"reflect"
-
-	"github.com/jackc/pgio"
-)
-
-type BoolArray struct {
-	Elements   []Bool
-	Dimensions []ArrayDimension
-	Valid      bool
-}
-
-func (dst *BoolArray) Set(src interface{}) error {
-	// untyped nil and typed nil interfaces are different
-	if src == nil {
-		*dst = BoolArray{}
-		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 []bool:
-		if value == nil {
-			*dst = BoolArray{}
-		} else if len(value) == 0 {
-			*dst = BoolArray{Valid: true}
-		} else {
-			elements := make([]Bool, len(value))
-			for i := range value {
-				if err := elements[i].Set(value[i]); err != nil {
-					return err
-				}
-			}
-			*dst = BoolArray{
-				Elements:   elements,
-				Dimensions: []ArrayDimension{{Length: int32(len(elements)), LowerBound: 1}},
-				Valid:      true,
-			}
-		}
-
-	case []*bool:
-		if value == nil {
-			*dst = BoolArray{}
-		} else if len(value) == 0 {
-			*dst = BoolArray{Valid: true}
-		} else {
-			elements := make([]Bool, len(value))
-			for i := range value {
-				if err := elements[i].Set(value[i]); err != nil {
-					return err
-				}
-			}
-			*dst = BoolArray{
-				Elements:   elements,
-				Dimensions: []ArrayDimension{{Length: int32(len(elements)), LowerBound: 1}},
-				Valid:      true,
-			}
-		}
-
-	case []Bool:
-		if value == nil {
-			*dst = BoolArray{}
-		} else if len(value) == 0 {
-			*dst = BoolArray{Valid: true}
-		} else {
-			*dst = BoolArray{
-				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 = BoolArray{}
-			return nil
-		}
-
-		dimensions, elementsLength, ok := findDimensionsFromValue(reflectedValue, nil, 0)
-		if !ok {
-			return fmt.Errorf("cannot find dimensions of %v for BoolArray", src)
-		}
-		if elementsLength == 0 {
-			*dst = BoolArray{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 BoolArray", src)
-		}
-
-		*dst = BoolArray{
-			Elements:   make([]Bool, 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([]Bool, 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 BoolArray, expected %d dst.Elements, but got %d instead", src, len(dst.Elements), elementCount)
-		}
-	}
-
-	return nil
-}
-
-func (dst *BoolArray) 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 BoolArray")
-	}
-	if err := dst.Elements[index].Set(value.Interface()); err != nil {
-		return 0, fmt.Errorf("%v in BoolArray", err)
-	}
-	index++
-
-	return index, nil
-}
-
-func (dst BoolArray) Get() interface{} {
-	if !dst.Valid {
-		return nil
-	}
-	return dst
-}
-
-func (src *BoolArray) 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 *[]bool:
-			*v = make([]bool, len(src.Elements))
-			for i := range src.Elements {
-				if err := src.Elements[i].AssignTo(&((*v)[i])); err != nil {
-					return err
-				}
-			}
-			return nil
-
-		case *[]*bool:
-			*v = make([]*bool, 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 *BoolArray) 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 BoolArray")
-	}
-	addr := value.Addr()
-	if !addr.CanInterface() {
-		return 0, fmt.Errorf("cannot assign all values from BoolArray")
-	}
-	if err := src.Elements[index].AssignTo(addr.Interface()); err != nil {
-		return 0, err
-	}
-	index++
-	return index, nil
-}
-
-func (dst *BoolArray) DecodeText(ci *ConnInfo, src []byte) error {
-	if src == nil {
-		*dst = BoolArray{}
-		return nil
-	}
-
-	uta, err := ParseUntypedTextArray(string(src))
-	if err != nil {
-		return err
-	}
-
-	var elements []Bool
-
-	if len(uta.Elements) > 0 {
-		elements = make([]Bool, len(uta.Elements))
-
-		for i, s := range uta.Elements {
-			var elem Bool
-			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 = BoolArray{Elements: elements, Dimensions: uta.Dimensions, Valid: true}
-
-	return nil
-}
-
-func (dst *BoolArray) DecodeBinary(ci *ConnInfo, src []byte) error {
-	if src == nil {
-		*dst = BoolArray{}
-		return nil
-	}
-
-	var arrayHeader ArrayHeader
-	rp, err := arrayHeader.DecodeBinary(ci, src)
-	if err != nil {
-		return err
-	}
-
-	if len(arrayHeader.Dimensions) == 0 {
-		*dst = BoolArray{Dimensions: arrayHeader.Dimensions, Valid: true}
-		return nil
-	}
-
-	elementCount := arrayHeader.Dimensions[0].Length
-	for _, d := range arrayHeader.Dimensions[1:] {
-		elementCount *= d.Length
-	}
-
-	elements := make([]Bool, elementCount)
-
-	for i := range elements {
-		elemLen := int(int32(binary.BigEndian.Uint32(src[rp:])))
-		rp += 4
-		var elemSrc []byte
-		if elemLen >= 0 {
-			elemSrc = src[rp : rp+elemLen]
-			rp += elemLen
-		}
-		err = elements[i].DecodeBinary(ci, elemSrc)
-		if err != nil {
-			return err
-		}
-	}
-
-	*dst = BoolArray{Elements: elements, Dimensions: arrayHeader.Dimensions, Valid: true}
-	return nil
-}
-
-func (src BoolArray) 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
-}
-
-func (src BoolArray) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
-	if !src.Valid {
-		return nil, nil
-	}
-
-	arrayHeader := ArrayHeader{
-		Dimensions: src.Dimensions,
-	}
-
-	if dt, ok := ci.DataTypeForName("bool"); ok {
-		arrayHeader.ElementOID = int32(dt.OID)
-	} else {
-		return nil, fmt.Errorf("unable to find oid for type name %v", "bool")
-	}
-
-	for i := range src.Elements {
-		if !src.Elements[i].Valid {
-			arrayHeader.ContainsNull = true
-			break
-		}
-	}
-
-	buf = arrayHeader.EncodeBinary(ci, buf)
-
-	for i := range src.Elements {
-		sp := len(buf)
-		buf = pgio.AppendInt32(buf, -1)
-
-		elemBuf, err := src.Elements[i].EncodeBinary(ci, buf)
-		if err != nil {
-			return nil, err
-		}
-		if elemBuf != nil {
-			buf = elemBuf
-			pgio.SetInt32(buf[sp:], int32(len(buf[sp:])-4))
-		}
-	}
-
-	return buf, nil
-}
-
-// Scan implements the database/sql Scanner interface.
-func (dst *BoolArray) 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 BoolArray) 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/bool_array_test.go b/pgtype/bool_array_test.go
deleted file mode 100644
index 7de5612a..00000000
--- a/pgtype/bool_array_test.go
+++ /dev/null
@@ -1,283 +0,0 @@
-package pgtype_test
-
-import (
-	"reflect"
-	"testing"
-
-	"github.com/jackc/pgx/v5/pgtype"
-	"github.com/jackc/pgx/v5/pgtype/testutil"
-)
-
-func TestBoolArrayTranscode(t *testing.T) {
-	testutil.TestSuccessfulTranscode(t, "bool[]", []interface{}{
-		&pgtype.BoolArray{
-			Elements:   nil,
-			Dimensions: nil,
-			Valid:      true,
-		},
-		&pgtype.BoolArray{
-			Elements: []pgtype.Bool{
-				{Bool: true, Valid: true},
-				{},
-			},
-			Dimensions: []pgtype.ArrayDimension{{Length: 2, LowerBound: 1}},
-			Valid:      true,
-		},
-		&pgtype.BoolArray{},
-		&pgtype.BoolArray{
-			Elements: []pgtype.Bool{
-				{Bool: true, Valid: true},
-				{Bool: true, Valid: true},
-				{Bool: false, Valid: true},
-				{Bool: true, Valid: true},
-				{},
-				{Bool: false, Valid: true},
-			},
-			Dimensions: []pgtype.ArrayDimension{{Length: 3, LowerBound: 1}, {Length: 2, LowerBound: 1}},
-			Valid:      true,
-		},
-		&pgtype.BoolArray{
-			Elements: []pgtype.Bool{
-				{Bool: true, Valid: true},
-				{Bool: false, Valid: true},
-				{Bool: true, Valid: true},
-				{Bool: false, Valid: true},
-			},
-			Dimensions: []pgtype.ArrayDimension{
-				{Length: 2, LowerBound: 4},
-				{Length: 2, LowerBound: 2},
-			},
-			Valid: true,
-		},
-	})
-}
-
-func TestBoolArraySet(t *testing.T) {
-	successfulTests := []struct {
-		source interface{}
-		result pgtype.BoolArray
-	}{
-		{
-			source: []bool{true},
-			result: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
-				Valid:      true},
-		},
-		{
-			source: (([]bool)(nil)),
-			result: pgtype.BoolArray{},
-		},
-		{
-			source: [][]bool{{true}, {false}},
-			result: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}, {Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-		},
-		{
-			source: [][][][]bool{{{{true, false, true}}}, {{{false, true, false}}}},
-			result: pgtype.BoolArray{
-				Elements: []pgtype.Bool{
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true},
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true},
-					{Bool: true, Valid: true},
-					{Bool: false, 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]bool{{true}, {false}},
-			result: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}, {Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-		},
-		{
-			source: [2][1][1][3]bool{{{{true, false, true}}}, {{{false, true, false}}}},
-			result: pgtype.BoolArray{
-				Elements: []pgtype.Bool{
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true},
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true},
-					{Bool: true, Valid: true},
-					{Bool: false, 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.BoolArray
-		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 TestBoolArrayAssignTo(t *testing.T) {
-	var boolSlice []bool
-	type _boolSlice []bool
-	var namedBoolSlice _boolSlice
-	var boolSliceDim2 [][]bool
-	var boolSliceDim4 [][][][]bool
-	var boolArrayDim2 [2][1]bool
-	var boolArrayDim4 [2][1][1][3]bool
-
-	simpleTests := []struct {
-		src      pgtype.BoolArray
-		dst      interface{}
-		expected interface{}
-	}{
-		{
-			src: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
-				Valid:      true,
-			},
-			dst:      &boolSlice,
-			expected: []bool{true},
-		},
-		{
-			src: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
-				Valid:      true,
-			},
-			dst:      &namedBoolSlice,
-			expected: _boolSlice{true},
-		},
-		{
-			src:      pgtype.BoolArray{},
-			dst:      &boolSlice,
-			expected: (([]bool)(nil)),
-		},
-		{
-			src:      pgtype.BoolArray{Valid: true},
-			dst:      &boolSlice,
-			expected: []bool{},
-		},
-		{
-			src: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}, {Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-			expected: [][]bool{{true}, {false}},
-			dst:      &boolSliceDim2,
-		},
-		{
-			src: pgtype.BoolArray{
-				Elements: []pgtype.Bool{
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true},
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true},
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{
-					{LowerBound: 1, Length: 2},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 3}},
-				Valid: true},
-			expected: [][][][]bool{{{{true, false, true}}}, {{{false, true, false}}}},
-			dst:      &boolSliceDim4,
-		},
-		{
-			src: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}, {Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-			expected: [2][1]bool{{true}, {false}},
-			dst:      &boolArrayDim2,
-		},
-		{
-			src: pgtype.BoolArray{
-				Elements: []pgtype.Bool{
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true},
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true},
-					{Bool: true, Valid: true},
-					{Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{
-					{LowerBound: 1, Length: 2},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 1},
-					{LowerBound: 1, Length: 3}},
-				Valid: true},
-			expected: [2][1][1][3]bool{{{{true, false, true}}}, {{{false, true, false}}}},
-			dst:      &boolArrayDim4,
-		},
-	}
-
-	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.BoolArray
-		dst interface{}
-	}{
-		{
-			src: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
-				Valid:      true,
-			},
-			dst: &boolSlice,
-		},
-		{
-			src: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}, {Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}, {LowerBound: 1, Length: 2}},
-				Valid:      true},
-			dst: &boolArrayDim2,
-		},
-		{
-			src: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}, {Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}, {LowerBound: 1, Length: 2}},
-				Valid:      true},
-			dst: &boolSlice,
-		},
-		{
-			src: pgtype.BoolArray{
-				Elements:   []pgtype.Bool{{Bool: true, Valid: true}, {Bool: false, Valid: true}},
-				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 2}, {LowerBound: 1, Length: 1}},
-				Valid:      true},
-			dst: &boolArrayDim4,
-		},
-	}
-
-	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/bool_test.go b/pgtype/bool_test.go
index 9a07491f..ec8c31d9 100644
--- a/pgtype/bool_test.go
+++ b/pgtype/bool_test.go
@@ -1,101 +1,21 @@
 package pgtype_test
 
 import (
-	"reflect"
 	"testing"
 
 	"github.com/jackc/pgx/v5/pgtype"
-	"github.com/jackc/pgx/v5/pgtype/testutil"
 )
 
-func TestBoolTranscode(t *testing.T) {
-	testutil.TestSuccessfulTranscode(t, "bool", []interface{}{
-		&pgtype.Bool{Bool: false, Valid: true},
-		&pgtype.Bool{Bool: true, Valid: true},
-		&pgtype.Bool{Bool: false},
+func TestBoolCodec(t *testing.T) {
+	testPgxCodec(t, "bool", []PgxTranscodeTestCase{
+		{true, new(bool), isExpectedEq(true)},
+		{false, new(bool), isExpectedEq(false)},
+		{true, new(pgtype.Bool), isExpectedEq(pgtype.Bool{Bool: true, Valid: true})},
+		{pgtype.Bool{}, new(pgtype.Bool), isExpectedEq(pgtype.Bool{})},
+		{nil, new(*bool), isExpectedEq((*bool)(nil))},
 	})
 }
 
-func TestBoolSet(t *testing.T) {
-	successfulTests := []struct {
-		source interface{}
-		result pgtype.Bool
-	}{
-		{source: true, result: pgtype.Bool{Bool: true, Valid: true}},
-		{source: false, result: pgtype.Bool{Bool: false, Valid: true}},
-		{source: "true", result: pgtype.Bool{Bool: true, Valid: true}},
-		{source: "false", result: pgtype.Bool{Bool: false, Valid: true}},
-		{source: "t", result: pgtype.Bool{Bool: true, Valid: true}},
-		{source: "f", result: pgtype.Bool{Bool: false, Valid: true}},
-		{source: _bool(true), result: pgtype.Bool{Bool: true, Valid: true}},
-		{source: _bool(false), result: pgtype.Bool{Bool: false, Valid: true}},
-		{source: nil, result: pgtype.Bool{}},
-	}
-
-	for i, tt := range successfulTests {
-		var r pgtype.Bool
-		err := r.Set(tt.source)
-		if err != nil {
-			t.Errorf("%d: %v", i, err)
-		}
-
-		if r != tt.result {
-			t.Errorf("%d: expected %v to convert to %v, but it was %v", i, tt.source, tt.result, r)
-		}
-	}
-}
-
-func TestBoolAssignTo(t *testing.T) {
-	var b bool
-	var _b _bool
-	var pb *bool
-	var _pb *_bool
-
-	simpleTests := []struct {
-		src      pgtype.Bool
-		dst      interface{}
-		expected interface{}
-	}{
-		{src: pgtype.Bool{Bool: false, Valid: true}, dst: &b, expected: false},
-		{src: pgtype.Bool{Bool: true, Valid: true}, dst: &b, expected: true},
-		{src: pgtype.Bool{Bool: false, Valid: true}, dst: &_b, expected: _bool(false)},
-		{src: pgtype.Bool{Bool: true, Valid: true}, dst: &_b, expected: _bool(true)},
-		{src: pgtype.Bool{Bool: false}, dst: &pb, expected: ((*bool)(nil))},
-		{src: pgtype.Bool{Bool: false}, dst: &_pb, expected: ((*_bool)(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.Bool
-		dst      interface{}
-		expected interface{}
-	}{
-		{src: pgtype.Bool{Bool: true, Valid: true}, dst: &pb, expected: true},
-		{src: pgtype.Bool{Bool: true, Valid: true}, dst: &_pb, expected: _bool(true)},
-	}
-
-	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)
-		}
-	}
-}
-
 func TestBoolMarshalJSON(t *testing.T) {
 	successfulTests := []struct {
 		source pgtype.Bool
diff --git a/pgtype/pgtype.go b/pgtype/pgtype.go
index fe3fae44..372f755b 100644
--- a/pgtype/pgtype.go
+++ b/pgtype/pgtype.go
@@ -292,7 +292,7 @@ func NewConnInfo() *ConnInfo {
 	ci := newConnInfo()
 
 	ci.RegisterDataType(DataType{Value: &ACLItemArray{}, Name: "_aclitem", OID: ACLItemArrayOID})
-	ci.RegisterDataType(DataType{Value: &BoolArray{}, Name: "_bool", OID: BoolArrayOID})
+	ci.RegisterDataType(DataType{Name: "_bool", OID: BoolArrayOID, Codec: &ArrayCodec{ElementCodec: BoolCodec{}, ElementOID: BoolOID}})
 	ci.RegisterDataType(DataType{Value: &BPCharArray{}, Name: "_bpchar", OID: BPCharArrayOID})
 	ci.RegisterDataType(DataType{Value: &ByteaArray{}, Name: "_bytea", OID: ByteaArrayOID})
 	ci.RegisterDataType(DataType{Value: &CIDRArray{}, Name: "_cidr", OID: CIDRArrayOID})
@@ -311,7 +311,7 @@ func NewConnInfo() *ConnInfo {
 	ci.RegisterDataType(DataType{Value: &VarcharArray{}, Name: "_varchar", OID: VarcharArrayOID})
 	ci.RegisterDataType(DataType{Value: &ACLItem{}, Name: "aclitem", OID: ACLItemOID})
 	ci.RegisterDataType(DataType{Value: &Bit{}, Name: "bit", OID: BitOID})
-	ci.RegisterDataType(DataType{Value: &Bool{}, Name: "bool", OID: BoolOID})
+	ci.RegisterDataType(DataType{Name: "bool", OID: BoolOID, Codec: BoolCodec{}})
 	ci.RegisterDataType(DataType{Value: &Box{}, Name: "box", OID: BoxOID})
 	ci.RegisterDataType(DataType{Value: &BPChar{}, Name: "bpchar", OID: BPCharOID})
 	ci.RegisterDataType(DataType{Value: &Bytea{}, Name: "bytea", OID: ByteaOID})
diff --git a/pgtype/zzz.bool.go b/pgtype/zzz.bool.go
deleted file mode 100644
index e6ed52de..00000000
--- a/pgtype/zzz.bool.go
+++ /dev/null
@@ -1,35 +0,0 @@
-package pgtype
-
-import "fmt"
-
-func (Bool) BinaryFormatSupported() bool {
-	return true
-}
-
-func (Bool) TextFormatSupported() bool {
-	return true
-}
-
-func (Bool) PreferredFormat() int16 {
-	return BinaryFormatCode
-}
-
-func (dst *Bool) DecodeResult(ci *ConnInfo, oid uint32, format int16, src []byte) error {
-	switch format {
-	case BinaryFormatCode:
-		return dst.DecodeBinary(ci, src)
-	case TextFormatCode:
-		return dst.DecodeText(ci, src)
-	}
-	return fmt.Errorf("unknown format code %d", format)
-}
-
-func (src Bool) EncodeParam(ci *ConnInfo, oid uint32, format int16, buf []byte) (newBuf []byte, err error) {
-	switch format {
-	case BinaryFormatCode:
-		return src.EncodeBinary(ci, buf)
-	case TextFormatCode:
-		return src.EncodeText(ci, buf)
-	}
-	return nil, fmt.Errorf("unknown format code %d", format)
-}