Duy Nguyen <pclouds@xxxxxxxxx> writes: > But it _is_ available now. If you need it, you write the extension > out. Are you arguing for making it omitted when it is not needed (e.g. small enough index file)? IOW, did you mean "If you do not need it, you do not write it out" by the above? I do not think overhead of writing (or preparing to write) the extension for a small index file is by definition small enough ;-). I do not think the configuration that decides if the reader side uses parallel reading should have any say in the decision to write (or omit) the extension, by the way.