Checks whether this configuration has a header, either for reading or writing.
Quote all cells, whether they need it or not.
Quote only cells that need it.
Use the specified character for cell separator.
Expect a header when reading, do not use one when writing.
If flag is true, expect a header when reading.
If flag is true, expect a header when reading. Otherwise, don't.
Expect a header when reading, use the specified sequence when writing.
Use the specified header configuration.
Use the specified quote character.
Use the specified quoting policy.
Do not use a header, either when reading or writing.
Configuration for how to read / write CSV data.
Note that all engines don't necessarily support all features.