a few tar.xz packages are bigger than their uncompressed tar

[Jérôme Bouat]

Hello

> No compression method need ever increase the
> size of the datum by more than one bit.
> 
> The compressed representation can begin with a header
> bit which is 1 to indicate "compressed" and 0 to indicate
> "stored without compression".

Does the xz format provide a checksum even if the file is stored without compression ?

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