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Spurious U+2060 (word joiner) characters in epub (Programming Scala)

I just started reading the EPUB version of Programming Scala on my Sony PRS-600, and I'm seeing spurious ? characters in the rendering. I unpacked the epub file to see what's going on, and see that there are U+2060 (WORD JOINER) characters are various spots (usually inside a code element). Technically, this is a bug in the PRS-600, as it should be able to correctly render the U-2060 (as nothing). But, I can't discern a good reason for the U+2060 characters either (this is the first EPUB from O'Reilly that I've obversed this). Any chance these can be removed?
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