According to references made in core-changes.txt it still appears to be a valid setting for pol.txt.
The two references I found are:
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03-08 Racalac
Very Significant speed improvement for all SystemFindObjectBySerial calls (including internal ones)! Your
start-up times (with CheckIntegrity enabled) should be vasty improved.
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02-09 Racalac
Changed: CheckIntegrity=1 in pol.cfg now also checks storage areas and offline character for duplicate serial
items (This extends start up times).