Better way of representing binary data in .csv output

I just noticed this: https://latest.datasette.io/fixtures/binary_data.csv

```csv
rowid,data
1,b'\x15\x1c\x02\xc7\xad\x05\xfe'
2,b'\x15\x1c\x03\xc7\xad\x05\xfe'
```
There's no good way to represent binary data in a CSV file, but this seems like one of the more-bad options.