CSVFormat fluent API is rather inefficient

The implementation of the CSVFormat fluent API is rather inefficient, as each method invocation clones the original class instance.

Now that the fields are volatile, it would be possible to do away with the clone() calls entirely.

This would mean that the format could be updated later.

If such usage is not desirable, then perhaps consider adding some kind of "freeze" method to prevent further changes.

Or perhaps the parse() and format() methods could perform the freeze (e.g. set a flag to disable further updates).