@cyan4973, may I change your first test case into something that won't
involve a download/build/install cycle? I was thinking about just using
the 0.5.1 version in xenial to try to decompress the 1.3.1 compressed
file I created in the test I just added to the bug description.
Something like this:

"""
* Downgrade zstd back to xenial's original version:

$ sudo apt install zstd=0.5.1-1

* Try to decompress the zst file created with the 1.3.1 version from the 
previous test. It should fail to recognize the format:
$ zstd -d snap.1.3.1.zst -o /dev/null
zstd: /dev/null already exists; do you wish to overwrite (y/N) ? y
zstd: snap.1.3.1.zst: not in zstd format 
"""

Would that be ok, and still be in the spirit of this update?

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https://bugs.launchpad.net/bugs/1717040

Title:
  Please backport libzstd 1.3.1+dfsg-1 (universe) from artful

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