[issue37921] Improve zipfile: add support for symlinks

[Henning von Bargen]

Henning von Bargen <h.vonbargen at gmail.com> added the comment:

If I understand correctly, 
this bug is about supporting symlinks on *creating* ZIP files.

Please see also https://bugs.python.org/issue27318 for a proposal to support symlinks while *unpacking* ZIP files.

Maybe a preserve_symlinks optional argument should be added to the `extract` and `extractall` method as well (the same argument name is used in `distutils.dir_util.copy_tree`).

Anyway, I think symlink support should be added for packing *and* unpacking or not at all.

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nosy: +Henning.von.Bargen

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