This seems very weird. Google shows some basic idea from 1999 and some patches to gzip/zlib later, but they don't seem to have it made into gzip or zlib, at least I find no mention of it in any Changes file or, again, via Google.

In reply to Re^4: gzseek for perl filehandles by Corion
in thread gzseek for perl filehandles by Anonymous Monk

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