I expect this will conflict with Eric's work on sessions, but we can deal with that.
There is a remaining quoting issue that needs to be dealt
with. E.g. with an unquoted string in the input, it comes out as
quoted in the result. This seems bad, since if you use the output as
new input you get something different (with extra
quoting). (non-idempotence if that's the right term).
| col1 | col2 | col3 |
|------+---------+------|
| 1 | 2 | 3 |
| 4 | schulte | 6 |
tabel
| "col1" | "col2" | "col3" |
|--------+-----------+--------|
| 1 | 2 | 3 |
| 4 | "schulte" | 6 |