By JON CARAMANICA

Miley Cyrus will turn 18 in November, though she’s been an adult for some time now. Ever since a suggestive 2008 Vanity Fair photo shoot thrust her out of the Disney cocoon into the mainstream consciousness, she’s been the subject of speculation, concern and fear. Ms. Cyrus, the chatterers argued, was in trouble but could still be saved.

And yet innocence has never been the core of Ms. Cyrus’s appeal. As the star of the Disney Channel’s

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