Comment 4 for bug 889303

I can confirm the gzip bug on current amd64 oneiric:

dpkg-deb -x /var/cache/apt/archives/libtasn1-3_2.10-1_i386.deb /tmp/i386

amd64 version:
$ md5sum /usr/share/doc/libtasn1-3/NEWS.gz
ab72644ef4dfcaac1e789c5f7da57fab /usr/share/doc/libtasn1-3/NEWS.gz
i386 version:
$ md5sum /tmp/i386/usr/share/doc/libtasn1-3/NEWS.gz
11d5af6dcae12ac9564ca7a6a2055cbf /tmp/i386/usr/share/doc/libtasn1-3/NEWS.gz

Curiously re-compressing the file on amd64 gives the i386 version to me:
$ gzip -cd /usr/share/doc/libtasn1-3/NEWS.gz | gzip -9n | md5sum -
11d5af6dcae12ac9564ca7a6a2055cbf -