GNU tar emits "tar: Ignoring unknown extended header keyword" warnings

[briandfoy]

• JSON::Validator version: 5.14
• Perl version: -
• Operating system: macOS, ArchLinux, Ubuntu 20.04, FreeBSD 12.3-RELEASE-p6

Steps to reproduce the behavior

• Download https://cpan.metacpan.org/authors/id/J/JH/JHTHORSEN/JSON-Validator-5.14.tar.gz
• untar with GNU tar: tar -xzf JSON-Validator-5.14.tar.gz

• see several warnings for:

  tar: Ignoring unknown extended header keyword 'LIBARCHIVE.xattr.com.apple.provenance'

Expected behavior

untar without warnings

The solution might be:

https://stackoverflow.com/questions/51655657/tar-ignoring-unknown-extended-header-keyword-libarchive-xattr-security-selinux

Actual behavior

Gets warnings.

I don't get these warnings for my own distributions, which are all made on macOS using GNU tar in /usr/local/bin/tar, but I also get these warnings on various Linux distros.