func (k *Key) parseInt64s(strs []string, addInvalid, returnOnInvalid bool) ([]int64, error) {
	vals := make([]int64, 0, len(strs))
	parser := func(str string) (interface{}, error) {
		val, err := strconv.ParseInt(str, 0, 64)
		return val, err
	}
	rawVals, err := k.doParse(strs, addInvalid, returnOnInvalid, parser)
	if err == nil {
		for _, val := range rawVals {
			vals = append(vals, val.(int64))
		}
	}
	return vals, err
}
parseInt64s transforms strings to int64s.
package ini
import (
	"bytes"
	"errors"
	"fmt"
	"strconv"
	"strings"
	"time"
)
type Key struct {
	s               *Section
	Comment         string
	name            string
	value           string
	isAutoIncrement bool
	isBooleanType   bool
	isShadow bool
	shadows  []*Key
	nestedValues []string
}
func newKey(s *Section, name, val string) *Key {
	return &Key{
		s:     s,
		name:  name,
		value: val,
	}
}
func (k *Key) addShadow(val string) error {
	if k.isShadow {
		return errors.New("cannot add shadow to another shadow key")
	} else if k.isAutoIncrement || k.isBooleanType {
		return errors.New("cannot add shadow to auto-increment or boolean key")
	}
	if !k.s.f.options.AllowDuplicateShadowValues {
		if k.value == val {
			return nil
		}
		for i := range k.shadows {
			if k.shadows[i].value == val {
				return nil
			}
		}
	}
	shadow := newKey(k.s, k.name, val)
	shadow.isShadow = true
	k.shadows = append(k.shadows, shadow)
	return nil
}
func (k *Key) AddShadow(val string) error {
	if !k.s.f.options.AllowShadows {
		return errors.New("shadow key is not allowed")
	}
	return k.addShadow(val)
}
func (k *Key) addNestedValue(val string) error {
	if k.isAutoIncrement || k.isBooleanType {
		return errors.New("cannot add nested value to auto-increment or boolean key")
	}
	k.nestedValues = append(k.nestedValues, val)
	return nil
}
func (k *Key) AddNestedValue(val string) error {
	if !k.s.f.options.AllowNestedValues {
		return errors.New("nested value is not allowed")
	}
	return k.addNestedValue(val)
}
type ValueMapper func(string) string
func (k *Key) Name() string {
	return k.name
}
func (k *Key) Value() string {
	return k.value
}
func (k *Key) ValueWithShadows() []string {
	if len(k.shadows) == 0 {
		return []string{k.value}
	}
	vals := make([]string, len(k.shadows)+1)
	vals[0] = k.value
	for i := range k.shadows {
		vals[i+1] = k.shadows[i].value
	}
	return vals
}
func (k *Key) NestedValues() []string {
	return k.nestedValues
}
func (k *Key) transformValue(val string) string {
	if k.s.f.ValueMapper != nil {
		val = k.s.f.ValueMapper(val)
	}
	if !strings.Contains(val, "%") {
		return val
	}
	for i := 0; i < depthValues; i++ {
		vr := varPattern.FindString(val)
		if len(vr) == 0 {
			break
		}
		noption := vr[2 : len(vr)-2]
		nk, err := k.s.GetKey(noption)
		if err != nil || k == nk {
			nk, _ = k.s.f.Section("").GetKey(noption)
			if nk == nil {
				break
			}
		}
		val = strings.Replace(val, vr, nk.value, -1)
	}
	return val
}
func (k *Key) String() string {
	return k.transformValue(k.value)
}
func (k *Key) Validate(fn func(string) string) string {
	return fn(k.String())
}
func parseBool(str string) (value bool, err error) {
	switch str {
	case "1", "t", "T", "true", "TRUE", "True", "YES", "yes", "Yes", "y", "ON", "on", "On":
		return true, nil
	case "0", "f", "F", "false", "FALSE", "False", "NO", "no", "No", "n", "OFF", "off", "Off":
		return false, nil
	}
	return false, fmt.Errorf("parsing \"%s\": invalid syntax", str)
}
func (k *Key) Bool() (bool, error) {
	return parseBool(k.String())
}
func (k *Key) Float64() (float64, error) {
	return strconv.ParseFloat(k.String(), 64)
}
func (k *Key) Int() (int, error) {
	v, err := strconv.ParseInt(k.String(), 0, 64)
	return int(v), err
}
func (k *Key) Int64() (int64, error) {
	return strconv.ParseInt(k.String(), 0, 64)
}
func (k *Key) Uint() (uint, error) {
	u, e := strconv.ParseUint(k.String(), 0, 64)
	return uint(u), e
}
func (k *Key) Uint64() (uint64, error) {
	return strconv.ParseUint(k.String(), 0, 64)
}
func (k *Key) Duration() (time.Duration, error) {
	return time.ParseDuration(k.String())
}
func (k *Key) TimeFormat(format string) (time.Time, error) {
	return time.Parse(format, k.String())
}
func (k *Key) Time() (time.Time, error) {
	return k.TimeFormat(time.RFC3339)
}
func (k *Key) MustString(defaultVal string) string {
	val := k.String()
	if len(val) == 0 {
		k.value = defaultVal
		return defaultVal
	}
	return val
}
func (k *Key) MustBool(defaultVal ...bool) bool {
	val, err := k.Bool()
	if len(defaultVal) > 0 && err != nil {
		k.value = strconv.FormatBool(defaultVal[0])
		return defaultVal[0]
	}
	return val
}
func (k *Key) MustFloat64(defaultVal ...float64) float64 {
	val, err := k.Float64()
	if len(defaultVal) > 0 && err != nil {
		k.value = strconv.FormatFloat(defaultVal[0], 'f', -1, 64)
		return defaultVal[0]
	}
	return val
}
func (k *Key) MustInt(defaultVal ...int) int {
	val, err := k.Int()
	if len(defaultVal) > 0 && err != nil {
		k.value = strconv.FormatInt(int64(defaultVal[0]), 10)
		return defaultVal[0]
	}
	return val
}
func (k *Key) MustInt64(defaultVal ...int64) int64 {
	val, err := k.Int64()
	if len(defaultVal) > 0 && err != nil {
		k.value = strconv.FormatInt(defaultVal[0], 10)
		return defaultVal[0]
	}
	return val
}
func (k *Key) MustUint(defaultVal ...uint) uint {
	val, err := k.Uint()
	if len(defaultVal) > 0 && err != nil {
		k.value = strconv.FormatUint(uint64(defaultVal[0]), 10)
		return defaultVal[0]
	}
	return val
}
func (k *Key) MustUint64(defaultVal ...uint64) uint64 {
	val, err := k.Uint64()
	if len(defaultVal) > 0 && err != nil {
		k.value = strconv.FormatUint(defaultVal[0], 10)
		return defaultVal[0]
	}
	return val
}
func (k *Key) MustDuration(defaultVal ...time.Duration) time.Duration {
	val, err := k.Duration()
	if len(defaultVal) > 0 && err != nil {
		k.value = defaultVal[0].String()
		return defaultVal[0]
	}
	return val
}
func (k *Key) MustTimeFormat(format string, defaultVal ...time.Time) time.Time {
	val, err := k.TimeFormat(format)
	if len(defaultVal) > 0 && err != nil {
		k.value = defaultVal[0].Format(format)
		return defaultVal[0]
	}
	return val
}
func (k *Key) MustTime(defaultVal ...time.Time) time.Time {
	return k.MustTimeFormat(time.RFC3339, defaultVal...)
}
func (k *Key) In(defaultVal string, candidates []string) string {
	val := k.String()
	for _, cand := range candidates {
		if val == cand {
			return val
		}
	}
	return defaultVal
}
func (k *Key) InFloat64(defaultVal float64, candidates []float64) float64 {
	val := k.MustFloat64()
	for _, cand := range candidates {
		if val == cand {
			return val
		}
	}
	return defaultVal
}
func (k *Key) InInt(defaultVal int, candidates []int) int {
	val := k.MustInt()
	for _, cand := range candidates {
		if val == cand {
			return val
		}
	}
	return defaultVal
}
func (k *Key) InInt64(defaultVal int64, candidates []int64) int64 {
	val := k.MustInt64()
	for _, cand := range candidates {
		if val == cand {
			return val
		}
	}
	return defaultVal
}
func (k *Key) InUint(defaultVal uint, candidates []uint) uint {
	val := k.MustUint()
	for _, cand := range candidates {
		if val == cand {
			return val
		}
	}
	return defaultVal
}
func (k *Key) InUint64(defaultVal uint64, candidates []uint64) uint64 {
	val := k.MustUint64()
	for _, cand := range candidates {
		if val == cand {
			return val
		}
	}
	return defaultVal
}
func (k *Key) InTimeFormat(format string, defaultVal time.Time, candidates []time.Time) time.Time {
	val := k.MustTimeFormat(format)
	for _, cand := range candidates {
		if val == cand {
			return val
		}
	}
	return defaultVal
}
func (k *Key) InTime(defaultVal time.Time, candidates []time.Time) time.Time {
	return k.InTimeFormat(time.RFC3339, defaultVal, candidates)
}
func (k *Key) RangeFloat64(defaultVal, min, max float64) float64 {
	val := k.MustFloat64()
	if val < min || val > max {
		return defaultVal
	}
	return val
}
func (k *Key) RangeInt(defaultVal, min, max int) int {
	val := k.MustInt()
	if val < min || val > max {
		return defaultVal
	}
	return val
}
func (k *Key) RangeInt64(defaultVal, min, max int64) int64 {
	val := k.MustInt64()
	if val < min || val > max {
		return defaultVal
	}
	return val
}
func (k *Key) RangeTimeFormat(format string, defaultVal, min, max time.Time) time.Time {
	val := k.MustTimeFormat(format)
	if val.Unix() < min.Unix() || val.Unix() > max.Unix() {
		return defaultVal
	}
	return val
}
func (k *Key) RangeTime(defaultVal, min, max time.Time) time.Time {
	return k.RangeTimeFormat(time.RFC3339, defaultVal, min, max)
}
func (k *Key) Strings(delim string) []string {
	str := k.String()
	if len(str) == 0 {
		return []string{}
	}
	runes := []rune(str)
	vals := make([]string, 0, 2)
	var buf bytes.Buffer
	escape := false
	idx := 0
	for {
		if escape {
			escape = false
			if runes[idx] != '\\' && !strings.HasPrefix(string(runes[idx:]), delim) {
				buf.WriteRune('\\')
			}
			buf.WriteRune(runes[idx])
		} else {
			if runes[idx] == '\\' {
				escape = true
			} else if strings.HasPrefix(string(runes[idx:]), delim) {
				idx += len(delim) - 1
				vals = append(vals, strings.TrimSpace(buf.String()))
				buf.Reset()
			} else {
				buf.WriteRune(runes[idx])
			}
		}
		idx++
		if idx == len(runes) {
			break
		}
	}
	if buf.Len() > 0 {
		vals = append(vals, strings.TrimSpace(buf.String()))
	}
	return vals
}
func (k *Key) StringsWithShadows(delim string) []string {
	vals := k.ValueWithShadows()
	results := make([]string, 0, len(vals)*2)
	for i := range vals {
		if len(vals) == 0 {
			continue
		}
		results = append(results, strings.Split(vals[i], delim)...)
	}
	for i := range results {
		results[i] = k.transformValue(strings.TrimSpace(results[i]))
	}
	return results
}
func (k *Key) Float64s(delim string) []float64 {
	vals, _ := k.parseFloat64s(k.Strings(delim), true, false)
	return vals
}
func (k *Key) Ints(delim string) []int {
	vals, _ := k.parseInts(k.Strings(delim), true, false)
	return vals
}
func (k *Key) Int64s(delim string) []int64 {
	vals, _ := k.parseInt64s(k.Strings(delim), true, false)
	return vals
}
func (k *Key) Uints(delim string) []uint {
	vals, _ := k.parseUints(k.Strings(delim), true, false)
	return vals
}
func (k *Key) Uint64s(delim string) []uint64 {
	vals, _ := k.parseUint64s(k.Strings(delim), true, false)
	return vals
}
func (k *Key) Bools(delim string) []bool {
	vals, _ := k.parseBools(k.Strings(delim), true, false)
	return vals
}
func (k *Key) TimesFormat(format, delim string) []time.Time {
	vals, _ := k.parseTimesFormat(format, k.Strings(delim), true, false)
	return vals
}
func (k *Key) Times(delim string) []time.Time {
	return k.TimesFormat(time.RFC3339, delim)
}
func (k *Key) ValidFloat64s(delim string) []float64 {
	vals, _ := k.parseFloat64s(k.Strings(delim), false, false)
	return vals
}
func (k *Key) ValidInts(delim string) []int {
	vals, _ := k.parseInts(k.Strings(delim), false, false)
	return vals
}
func (k *Key) ValidInt64s(delim string) []int64 {
	vals, _ := k.parseInt64s(k.Strings(delim), false, false)
	return vals
}
func (k *Key) ValidUints(delim string) []uint {
	vals, _ := k.parseUints(k.Strings(delim), false, false)
	return vals
}
func (k *Key) ValidUint64s(delim string) []uint64 {
	vals, _ := k.parseUint64s(k.Strings(delim), false, false)
	return vals
}
func (k *Key) ValidBools(delim string) []bool {
	vals, _ := k.parseBools(k.Strings(delim), false, false)
	return vals
}
func (k *Key) ValidTimesFormat(format, delim string) []time.Time {
	vals, _ := k.parseTimesFormat(format, k.Strings(delim), false, false)
	return vals
}
func (k *Key) ValidTimes(delim string) []time.Time {
	return k.ValidTimesFormat(time.RFC3339, delim)
}
func (k *Key) StrictFloat64s(delim string) ([]float64, error) {
	return k.parseFloat64s(k.Strings(delim), false, true)
}
func (k *Key) StrictInts(delim string) ([]int, error) {
	return k.parseInts(k.Strings(delim), false, true)
}
func (k *Key) StrictInt64s(delim string) ([]int64, error) {
	return k.parseInt64s(k.Strings(delim), false, true)
}
func (k *Key) StrictUints(delim string) ([]uint, error) {
	return k.parseUints(k.Strings(delim), false, true)
}
func (k *Key) StrictUint64s(delim string) ([]uint64, error) {
	return k.parseUint64s(k.Strings(delim), false, true)
}
func (k *Key) StrictBools(delim string) ([]bool, error) {
	return k.parseBools(k.Strings(delim), false, true)
}
func (k *Key) StrictTimesFormat(format, delim string) ([]time.Time, error) {
	return k.parseTimesFormat(format, k.Strings(delim), false, true)
}
func (k *Key) StrictTimes(delim string) ([]time.Time, error) {
	return k.StrictTimesFormat(time.RFC3339, delim)
}
func (k *Key) parseBools(strs []string, addInvalid, returnOnInvalid bool) ([]bool, error) {
	vals := make([]bool, 0, len(strs))
	parser := func(str string) (interface{}, error) {
		val, err := parseBool(str)
		return val, err
	}
	rawVals, err := k.doParse(strs, addInvalid, returnOnInvalid, parser)
	if err == nil {
		for _, val := range rawVals {
			vals = append(vals, val.(bool))
		}
	}
	return vals, err
}
func (k *Key) parseFloat64s(strs []string, addInvalid, returnOnInvalid bool) ([]float64, error) {
	vals := make([]float64, 0, len(strs))
	parser := func(str string) (interface{}, error) {
		val, err := strconv.ParseFloat(str, 64)
		return val, err
	}
	rawVals, err := k.doParse(strs, addInvalid, returnOnInvalid, parser)
	if err == nil {
		for _, val := range rawVals {
			vals = append(vals, val.(float64))
		}
	}
	return vals, err
}
func (k *Key) parseInts(strs []string, addInvalid, returnOnInvalid bool) ([]int, error) {
	vals := make([]int, 0, len(strs))
	parser := func(str string) (interface{}, error) {
		val, err := strconv.ParseInt(str, 0, 64)
		return val, err
	}
	rawVals, err := k.doParse(strs, addInvalid, returnOnInvalid, parser)
	if err == nil {
		for _, val := range rawVals {
			vals = append(vals, int(val.(int64)))
		}
	}
	return vals, err
}