Should CabalFileText and BackupByteString wrap strict ByteStrings?

```haskell
data BackupEntry =
    BackupByteString [FilePath] ByteString
  | BackupBlob [FilePath] BlobId

newtype CabalFileText = CabalFileText { cabalFileByteString :: ByteString }
```

Both `ByteString`s here are lazy ones. Isn't it asking for trouble with file descriptors?..