size   int64 // actual object size regardless of compression/encryption
	offset int64
	reader io.ReadCloser

	// reader can be closed idempotently multiple times
	closerOnce sync.Once
	// Error storing reader.Close()
	closerErr error
}

// NewObjectReadSeekCloser creates a new ObjectReadSeekCloser.
func NewObjectReadSeekCloser(segmentReader ObjectSegmentReaderFn, actualSize int64) *ObjectReadSeekCloser {