I can't reproduce the problem on x86-64 with vanilla gzip 1.4 and vanilla gzip 1.3.12. So the problem appears to be either architecture-dependent, or it's a property of the Debian patches to gzip, or something like that, and I expect we'll need more information about how to reproduce the problem. It looks like the problem is with 1.3.12-9 on armel so you might want to focus your attention there.
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