return oi, InvalidArgument{
				Bucket: bucket,
				Object: fi.Name,
				Err:    fmt.Errorf("checksum type mismatch. got %q (%s) expected %q (%s)", checksumType.String(), checksumType.ObjType(), opts.WantChecksum.Type.String(), opts.WantChecksum.Type.ObjType()),
			}
		}
		checksumType |= hash.ChecksumMultipart | hash.ChecksumIncludesMultipart
	}

	var checksumCombined []byte