Roly poly puchi

Chetan dropped this into my hand while at the Yercaud camp this summer. No, its not a nut or fruit, but a roly poly puchi!  It was so tightly rolled up like one of those well-made cases that cannot be opened.

Leave it alone, and after a good 45 seconds, it slowly unfurls and becomes this.

Seems to be, this is a pill millipede, and not a pill bug.  The latter is actually a crustacean, and from what I read, my puchi seems to be a puchi only and therefore the former.  I may be wrong, may be right....

Thirteen body segments and they feed on dead matter from what I read.  So, not a pest, but one of those little ancient critters that quietly go about recycling decomposing plant matter.