b = append(b, parts...)
		}
	}
	return b
}

// ChecksumFromBytes reconstructs a Checksum struct from the serialized bytes created in AppendTo()
// Returns nil if the bytes are invalid or empty.
// AppendTo() can append a serialized Checksum to another already-serialized Checksum,
// however, in practice, we only use one at a time.
// ChecksumFromBytes only returns the first one and no part checksums.