RANGE_ADD same object insertion

I've implemented RANGE_ADD which works well but if I submit the exact same object I get the following issue I notice the object is added but their id's are the same.


Start by reproducing the reported RANGE_ADD case with the exact same object and inspect the resulting object IDs. Trace the mutation handling from the RANGE_ADD entry point to determine where duplicate IDs are produced; done means the behavior is corrected and covered by a regression test.

Written by the indexing model from the issue text.