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but you are rolling the dice.
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Yes, I guess you are right. I could always check that the mimetype file remains uncompressed (with e.g. advzip -l).
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Asides, I am not a fan of zopfli -- it is so damned slow.
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Well, it's not something I have to run thousands of times a day, just once when the ebook is ready. I usually get a reduction to ~98% filesize, so I could also do without it.