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Changes between Version 1 and Version 2 of Ticket #28514, comment 6

v1	v2
20	20	* First try bulk_insert, if it does not throw exception, send m2m_changed signal.
21	21	* Either update the documentation of .add() accordingly (if it throws IntegrityError, the caller shall retry the operation), or make .add() do the retries internally.
22		* Once bulk_create(... on_conflict='ignore') [#28668] is implemented, revert the previous step, pass on_conflict='ignore' to bulk_create, and:
	22	* Once bulk_create(... on_conflict='ignore') [https://code.djangoproject.com/ticket/28668 #28668] is implemented, revert the previous step, pass on_conflict='ignore' to bulk_create, and:
23	23	* In case of Postgresql retrieve information from bulk_create which objects were actually inserted, and send only for them m2m_changed
24	24	* For other databases, either send signal for all objects, even those which were in the database, don't use bulk_create or throw IntegrityError