It was removed by oversight. This was detected after shipping the 1.33.1 beta and has since been re-checked in. Also the test_reset_object_address was updated to detect this if it occurs again. So it should appear in the 1.33.1 official release. Robert Ramey Topi Mäenpää wrote:

Hi,

reset_object_address is no more a member of polymorphic_iarchive in 1.33.1 beta. Why not?