Description Caspar D. 2010-08-04 07:56:07 EDT

The implementation uses two fields lastLookupID/lastLookupObject,
presumably to optimize lookup performance for repeated lookups of
the same object.

But the mistaken assumption here is that the ID will continue to refer
to the same object; this isn't necessarily the case, as the getObject
function may well have been called with a temporary ID, and such an ID
may, as a consequence of a commit and subsequent creation of new
objects, later designate a different object.

See testcase that I'll attach in a minute.