diff --git a/dbase/database.go b/dbase/database.go
index 8bee067..bc86455 100644
--- a/dbase/database.go
+++ b/dbase/database.go
@@ -1,6 +1,7 @@
 package dbase
 
 import (
+	"errors"
 	"fmt"
 	"path"
 	"path/filepath"
@@ -16,10 +17,10 @@ type Database struct {
 // The database file must be a DBC file and the tables must be DBF files and in the same directory as the database
 func OpenDatabase(config *Config) (*Database, error) {
 	if config == nil {
-		return nil, newError("dbase-io-opendatabase-1", fmt.Errorf("missing config"))
+		return nil, newError("dbase-io-opendatabase-1", errors.New("missing config"))
 	}
 	if len(strings.TrimSpace(config.Filename)) == 0 {
-		return nil, newError("dbase-io-opendatabase-2", fmt.Errorf("missing filename"))
+		return nil, newError("dbase-io-opendatabase-2", errors.New("missing filename"))
 	}
 	if strings.ToUpper(filepath.Ext(config.Filename)) != string(DBC) {
 		return nil, newError("dbase-io-opendatabase-3", fmt.Errorf("invalid file name: %v", config.Filename))
@@ -47,7 +48,7 @@ func OpenDatabase(config *Config) (*Database, error) {
 		}
 		tableName, ok := objectName.(string)
 		if !ok {
-			return nil, newError("dbase-io-opendatabase-8", fmt.Errorf("table name is not a string"))
+			return nil, newError("dbase-io-opendatabase-8", errors.New("table name is not a string"))
 		}
 		tableName = strings.Trim(tableName, " ")
 		if tableName == "" {
diff --git a/dbase/file.go b/dbase/file.go
index 25c1888..0cc811c 100644
--- a/dbase/file.go
+++ b/dbase/file.go
@@ -2,6 +2,7 @@ package dbase
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"reflect"
 	"strings"
@@ -238,7 +239,7 @@ func (file *File) BytesToRow(data []byte) (*Row, error) {
 	// a row should start with te delete flag, a space ACTIVE(0x20) or DELETED(0x2A)
 	rec.Deleted = Marker(data[0]) == Deleted
 	if !rec.Deleted && Marker(data[0]) != Active {
-		return nil, newError("dbase-table-bytestorow-2", fmt.Errorf("invalid row data, no delete flag found at beginning of row"))
+		return nil, newError("dbase-table-bytestorow-2", errors.New("invalid row data, no delete flag found at beginning of row"))
 	}
 	// deleted flag already read
 	offset := uint16(1)
diff --git a/dbase/interpreter.go b/dbase/interpreter.go
index d1910df..f5d222f 100644
--- a/dbase/interpreter.go
+++ b/dbase/interpreter.go
@@ -4,6 +4,7 @@ import (
 	"encoding/binary"
 	"fmt"
 	"math"
+	"strconv"
 	"time"
 )
 
@@ -268,8 +269,8 @@ func (file *File) getFloatRepresentation(field *Field, skipSpacing bool) ([]byte
 	}
 	var bin []byte
 	if b == float64(int64(b)) {
-		// if the value is an integer, store as integer
-		bin = []byte(fmt.Sprintf("%d", int64(b)))
+		// if the value has no decimals, store as integer
+		bin = []byte(strconv.FormatInt(int64(b), 10))
 	} else {
 		// if the value is a float, store as float
 		expression := fmt.Sprintf("%%.%df", field.column.Decimals)
@@ -431,8 +432,8 @@ func (file *File) getNumericRepresentation(field *Field, skipSpacing bool) ([]by
 	f, fok := field.value.(float64)
 	if fok {
 		if f == float64(int64(f)) {
-			// if the value is an integer, store as integer
-			bin = []byte(fmt.Sprintf("%d", int64(f)))
+			// if the value has no decimals, store as integer
+			bin = []byte(strconv.FormatInt(int64(f), 10))
 		} else {
 			// if the value is a float, store as float
 			expression := fmt.Sprintf("%%.%df", field.column.Decimals)
diff --git a/dbase/io_generic.go b/dbase/io_generic.go
index 0157fbc..5d0f6bc 100644
--- a/dbase/io_generic.go
+++ b/dbase/io_generic.go
@@ -3,6 +3,7 @@ package dbase
 import (
 	"bytes"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"io"
 	"path/filepath"
@@ -21,7 +22,7 @@ type GenericIO struct {
 
 func (g GenericIO) OpenTable(config *Config) (*File, error) {
 	if config == nil {
-		return nil, newError("dbase-io-generic-opentable-1", fmt.Errorf("missing configuration"))
+		return nil, newError("dbase-io-generic-opentable-1", errors.New("missing configuration"))
 	}
 	debugf("Opening table from custom io interface - Untested: %v - Trim spaces: %v - ValidateCodepage: %v - InterpretCodepage: %v", config.Untested, config.TrimSpaces, config.ValidateCodePage, config.InterpretCodePage)
 	fileName := filepath.Clean(config.Filename)
@@ -71,7 +72,7 @@ func (g GenericIO) OpenTable(config *Config) (*File, error) {
 	// If the FPT file does not exist an error is returned.
 	if MemoFlag.Defined(file.header.TableFlags) {
 		if file.relatedHandle == nil {
-			return nil, newError("dbase-io-generic-opentable-6", fmt.Errorf("no related handle defined"))
+			return nil, newError("dbase-io-generic-opentable-6", errors.New("no related handle defined"))
 		}
 		err = file.ReadMemoHeader()
 		if err != nil {
@@ -431,7 +432,7 @@ func (g GenericIO) ReadNullFlag(file *File, position uint64, column *Column) (bo
 		return false, false, newError("dbase-io-generic-readnullflag-1", err)
 	}
 	if file.nullFlagColumn == nil || (column.DataType != byte(Varchar) && column.DataType != byte(Varbinary)) {
-		return false, false, newError("dbase-io-generic-readnullflag-2", fmt.Errorf("null flag column missing or not a varchar/varbinary field"))
+		return false, false, newError("dbase-io-generic-readnullflag-2", errors.New("null flag column missing or not a varchar/varbinary field"))
 	}
 	nullFlagPosition := file.table.nullFlagPosition(column)
 	position = uint64(file.header.FirstRow) + position*uint64(file.header.RowLength) + uint64(file.nullFlagColumn.Position)
@@ -519,7 +520,7 @@ func (g GenericIO) WriteRow(file *File, row *Row) error {
 
 func (g GenericIO) Search(file *File, field *Field, exactMatch bool) ([]*Row, error) {
 	if field.column.DataType == 'M' {
-		return nil, newError("dbase-io-generic-search-1", fmt.Errorf("searching memo fields is not supported"))
+		return nil, newError("dbase-io-generic-search-1", errors.New("searching memo fields is not supported"))
 	}
 	handle, err := g.getHandle(file)
 	if err != nil {
diff --git a/dbase/io_windows.go b/dbase/io_windows.go
index a721b96..32e7bba 100644
--- a/dbase/io_windows.go
+++ b/dbase/io_windows.go
@@ -6,6 +6,7 @@ package dbase
 import (
 	"bytes"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"os"
 	"path"
@@ -25,7 +26,7 @@ type WindowsIO struct{}
 
 func (w WindowsIO) OpenTable(config *Config) (*File, error) {
 	if config == nil || len(strings.TrimSpace(config.Filename)) == 0 {
-		return nil, newError("dbase-io-windows-opentable-1", fmt.Errorf("missing configuration or filename"))
+		return nil, newError("dbase-io-windows-opentable-1", errors.New("missing configuration or filename"))
 	}
 	debugf("Opening table: %s - Read-only: %v - Exclusive: %v - Untested: %v - Trim spaces: %v - Write lock: %v - ValidateCodepage: %v - InterpretCodepage: %v", config.Filename, config.ReadOnly, config.Exclusive, config.Untested, config.TrimSpaces, config.WriteLock, config.ValidateCodePage, config.InterpretCodePage)
 	var err error
@@ -161,7 +162,7 @@ func (w WindowsIO) Create(file *File) error {
 	file.config.Filename = strings.ToUpper(strings.TrimSpace(file.config.Filename))
 	// Check for valid file name
 	if len(file.config.Filename) == 0 {
-		return newError("dbase-io-windows-create-1", fmt.Errorf("missing filename"))
+		return newError("dbase-io-windows-create-1", errors.New("missing filename"))
 	}
 	dbfname, err := windows.UTF16FromString(file.config.Filename)
 	if err != nil {
@@ -170,7 +171,7 @@ func (w WindowsIO) Create(file *File) error {
 	// Check if file exists already
 	_, err = windows.GetFileAttributes(&dbfname[0])
 	if err == nil {
-		return newError("dbase-io-windows-create-3", fmt.Errorf("file already exists"))
+		return newError("dbase-io-windows-create-3", errors.New("file already exists"))
 	}
 	// Create the file
 	debugf("Creating file: %s", file.config.Filename)
@@ -388,7 +389,7 @@ func (w WindowsIO) ReadNullFlag(file *File, position uint64, column *Column) (bo
 		return false, false, newError("dbase-io-windows-readnullflag-1", err)
 	}
 	if file.nullFlagColumn == nil || (column.DataType != byte(Varchar) && column.DataType != byte(Varbinary)) {
-		return false, false, newError("dbase-io-windows-readnullflag-2", fmt.Errorf("null flag column is nil or column is not varchar or varbinary"))
+		return false, false, newError("dbase-io-windows-readnullflag-2", errors.New("null flag column is nil or column is not varchar or varbinary"))
 	}
 	nullFlagPosition := file.table.nullFlagPosition(column)
 	pos := uint64(file.header.FirstRow) + position*uint64(file.header.RowLength) + uint64(file.nullFlagColumn.Position)
@@ -688,7 +689,7 @@ func (w WindowsIO) WriteRow(file *File, row *Row) (err error) {
 
 func (w WindowsIO) Search(file *File, field *Field, exactMatch bool) ([]*Row, error) {
 	if field.column.DataType == 'M' {
-		return nil, newError("dbase-io-windows-search-1", fmt.Errorf("searching memo fields is not supported"))
+		return nil, newError("dbase-io-windows-search-1", errors.New("searching memo fields is not supported"))
 	}
 	handle, err := w.getHandle(file)
 	if err != nil {
diff --git a/dbase/table.go b/dbase/table.go
index b772c70..62292fc 100644
--- a/dbase/table.go
+++ b/dbase/table.go
@@ -114,7 +114,7 @@ func (row *Row) StringValueByName(name string) (string, error) {
 		if ok {
 			return string(sanitizeString(bslice)), nil
 		}
-		return "", newError("dbase-table-stringvaluebyname-2", fmt.Errorf("value is not a string"))
+		return "", newError("dbase-table-stringvaluebyname-2", errors.New("value is not a string"))
 	}
 	return "", nil
 }
@@ -142,7 +142,7 @@ func (row *Row) IntValueByName(name string) (int64, error) {
 		if ok {
 			return intVal, nil
 		}
-		return 0, newError("dbase-table-intvaluebyname-2", fmt.Errorf("value is not an int"))
+		return 0, newError("dbase-table-intvaluebyname-2", errors.New("value is not an int"))
 	}
 	return 0, nil
 }
@@ -170,7 +170,7 @@ func (row *Row) FloatValueByName(name string) (float64, error) {
 		if ok {
 			return floatVal, nil
 		}
-		return 0, newError("dbase-table-floatvaluebyname-2", fmt.Errorf("value is not a float"))
+		return 0, newError("dbase-table-floatvaluebyname-2", errors.New("value is not a float"))
 	}
 	return 0, nil
 }
@@ -197,7 +197,7 @@ func (row *Row) BoolValueByName(name string) (bool, error) {
 		if ok {
 			return boolVal, nil
 		}
-		return false, newError("dbase-table-boolvaluebyname-2", fmt.Errorf("value is not a bool"))
+		return false, newError("dbase-table-boolvaluebyname-2", errors.New("value is not a bool"))
 	}
 
 	return false, nil
@@ -226,7 +226,7 @@ func (row *Row) TimeValueByName(name string) (time.Time, error) {
 		if ok {
 			return timeVal, nil
 		}
-		return time.Time{}, newError("dbase-table-timevaluebyname-2", fmt.Errorf("value is not a time"))
+		return time.Time{}, newError("dbase-table-timevaluebyname-2", errors.New("value is not a time"))
 	}
 	return time.Time{}, nil
 }
@@ -262,7 +262,7 @@ func (row *Row) BytesValueByName(name string) ([]byte, error) {
 		if ok {
 			return []byte(strVal), nil
 		}
-		return nil, newError("dbase-table-bytesvaluebyname-2", fmt.Errorf("value is not a byte slice"))
+		return nil, newError("dbase-table-bytesvaluebyname-2", errors.New("value is not a byte slice"))
 	}
 	return nil, nil
 }
@@ -462,7 +462,7 @@ func (c *Column) Reflect() (reflect.Type, error) {
 // SetValue allows to change the field value
 func (field *Field) SetValue(value interface{}) error {
 	if field == nil {
-		return newError("dbase-table-setvalue-1", fmt.Errorf("field is not defined by table"))
+		return newError("dbase-table-setvalue-1", errors.New("field is not defined by table"))
 	}
 	field.value = value
 	return nil