20130530.sessionhash.php
a82584850b3bproduction

20130530.sessionhash.php
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			<?php

			// See T13225. Long ago, this upgraded session key storage from unhashed to
			// HMAC-SHA1 here. We later upgraded storage to HMAC-SHA256, so this is initial
			// upgrade is now fairly pointless. Dropping this migration entirely only logs
			// users out of installs that waited more than 5 years to upgrade, which seems
			// like a reasonable behavior.