green oak timber

Ok, i know this is not an arb question but maybe one of you can point me in the right direction for info. It concerns woodworking with green oak.
A friend of mine, experienced at timber framing and working with green wood in general, was explaining to me that over time, oak will elongate as it dries. I have never heard of any timber expanding longitudinally as it seasons, but my friend swore that he was absolutely sure of this and that it was common knowledge among green woodworkers. For example he claimed that traditionally, tenons were always left shorter than the depth of the mortice, to allow for later stretching. Has anybody else ever heard of it? Can you explain why it might happen? I am currently building with green oak and need to know if its a known occurrence or a load of rubbish. Thanks!
 

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