Lossless compression of dng files like in Lightroom?

Lightroom losslessly compresses DNG files to half their size, which is wonderful. Is there any way to get Aperture to do this?

I remember seeing a plug-in to call the DNG converter from Aperture, but I think it never leaved the beta phase.
Anyway, using Adobe's converter is no big deal, and it's free.

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