func NewValueIterator(format Format, reader io.Reader) *Iterator {
	return NewIterator(reader, FieldValueUnmarshaller(format))
}
func NewValueIterator(format Format, reader io.Reader) *Iterator {
	return NewIterator(reader, FieldValueUnmarshaller(format))
}
func NewValueIterator ( format Format , reader io . Reader ) * Iterator { return NewIterator ( reader , FieldValueUnmarshaller ( format ) ) }
// NewValueIterator creates a new iterator for value data.
NewValueIterator creates a new iterator for value data .