stat

type Result interface {
	fmt.Stringer
	error
	encoding.BinaryMarshaler
	encoding.BinaryUnmarshaler
	Log(fileNum int) string
	Name() string
	IncrRecords()
	IncrDuplicates()
	AddError(err error)
	Records() int64
	ErrorCount() int64
	Errors() []error
	Duplicates() int64
}

type Stats struct {
	Files      int
	Records    int64
	Errors     int64
	Duplicates int64
}