Symlinks are not preserved on unpack

[LINKIWI]

tar-pack does not seem to preserve symlinks created during pack. For example, say node_modules contains symlinks in the directory .bin (which it does),

const tarPack = require('tar-pack');

const readStream = tarPack.pack('node_modules`);
readStream.pipe(tarPack.unpack('node_modules2', {keepFiles: true}));

Expected behavior: node_modules/.bin contains several symlinks, and node_modules2/.bin also contains the same relative symlinks.
Actual behavior: node_modules/.bin contains several symlinks, and node_modules2/.binis an empty directory.

Note that un-taring the .tar.gz using tar xvf <filename> causes the symlinks to be preserved correctly.

As far as I can tell there is no flag or option on unpack to configure this behavior, so I suspect this is a bug.

[LINKIWI]

https://github.com/ForbesLindesay/tar-pack/blob/master/index.js#L161

This is a very misleading comment. Symbolic links are absolutely allowed in packages. Perhaps there is some context I'm missing here? The problem described above is no longer observed after forcing extractOpts.filter to always return true.