func (f *Int64Flag) String() string {
	return FlagStringer(f)
}
String returns a readable representation of this value
(for usage defaults)
package cli
import (
	"flag"
	"fmt"
	"strconv"
)
type Int64Flag struct {
	Name        string
	Aliases     []string
	Usage       string
	EnvVars     []string
	FilePath    string
	Required    bool
	Hidden      bool
	Value       int64
	DefaultText string
	Destination *int64
	HasBeenSet  bool
}
func (f *Int64Flag) IsSet() bool {
	return f.HasBeenSet
}