See page 7 of https://www.ietf.org/rfc/rfc1952.txt (ISIZE is the
relevant field)

It is an limitation of the gzip file format...

It is also documented in the gzip man page under "BUGS", with a (slow)
workaround...

One way to fix it might be to define an "extra field" with a larger
original file size... The extra fields go into the header though,
instead of the trailer, which means that it can't be correctly populated
for data piped through gzip, since the size is not known when the header
is written... (This also seems to be the suggestion here:
https://lists.gnu.org/archive/html/bug-gzip/2010-08/msg00009.html )

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https://bugs.launchpad.net/bugs/1022287

Title:
  negative compression ratio if list a big gzip file

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