Default options passed to [Archiver](https://github.com/archiverjs/node-archiver)'s [constructor](https://archiverjs.com/docs/Archiver.html) and merged into the [data](https://archiverjs.com/docs/global.html#TarEntryData) passed to its [`append`](https://archiverjs.com/docs/Archiver.html#append) method.