Triaged
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https://code.djangoproject.com/ticket/26718 - add system check for existence of the fields specified by ForeignKey.to_field (accepted)
https://code.djangoproject.com/ticket/26717 - Allow customizing stream attribute of Serializer for custom serializers (accepted)
https://code.djangoproject.com/ticket/26721 - Document redirecting dumpdata output may result in incorrect encoding in Windows PowerShell (accepted)
https://code.djangoproject.com/ticket/4548 - Add a username hint for password managers to admin's change_password form (accepted)
https://code.djangoproject.com/ticket/26730 - Make AutoField consistent between postgresql and mysql (duplicate)
https://code.djangoproject.com/ticket/26729 - TabularInline not respecting form's custom label and help text if set in form's __init__ method (accepted)
https://code.djangoproject.com/ticket/2361 - QuerySet.filter(m2mfield__isnull=False) may return duplicates (accepted)
https://code.djangoproject.com/ticket/26733 - ContentType.get_object_for_this_type fetches models from wrong database (duplicate)
https://code.djangoproject.com/ticket/26740 - "Key column doesn't exist in table" when adding an index field then renaming it in the same migration in MySQL/PostgreSQL (duplicate)
https://code.djangoproject.com/ticket/26744 - Accept-Language header parsing accepts some invalid q values (accepted)
Authored
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https://github.com/django/djangoproject.com/pull/666 - Fixed #665 -- Fixed docs version switcher sorting.Reviewed/committed
------------------
https://github.com/django/django/pull/6715 - Fixed #26707 -- Added QueryDict.fromkeys()
https://github.com/django/django/pull/6724 - Fixed #26474 -- Added sources of minified javascript files.
https://github.com/django/django/pull/6732 - Fixed #26713 -- Documented resolving deprecation warnings before upgrade.
https://github.com/django/django/pull/6736 - Fixed #26716 -- Made CurrentSiteMiddleware compatible with new-style middleware.
https://github.com/django/django/pull/6706 - Fixed #10107 -- Allowed using mark_safe() as a decorator.
https://github.com/django/django/pull/6709 - Fixed #26704 -- Documented DjangoJSONEncoder.
https://github.com/django/django/pull/6705 - Fixed #26702 -- Documented how to change the base class of a custom field.
https://github.com/django/django/pull/6740 - Fixed #26290 -- Warned that paginating an unordered QuerySet may result in inconsistent results.
https://github.com/django/django/pull/6717 - Fixed #26705 -- Fixed plural versions of languages not supported by Django.
https://github.com/django/django/pull/6497 - Fixed #26524 - Made a foreign key id reference in ModelAdmin.list_display display the id.
https://github.com/django/django/pull/6739 - Fixed #26718 -- Added system check for existence of the fields specified by ForeignKey.to_field.
https://github.com/django/django/pull/6615 - Fixed #20468 -- Added loaddata --exclude option.
https://github.com/django/django/pull/6572 - Fixed #26734 -- Made iterator class configurable on ModelChoiceField.
https://github.com/django/django/pull/6640 - Fixed #26648 -- Added a system check for invalid related_query_name's containing underscores.
https://github.com/django/django/pull/6745 - Fixed #4548 -- Added username hint to admin's change_password form.
https://github.com/django/django/pull/6711 - Fixed #12810 -- Added a check for clashing ManyToManyField.db_table names.
https://github.com/django/django/pull/6750 - Fixed #26742 -- Fixed action select color in admin changelist.
https://github.com/django/django/pull/6754 - Fixed #26736 -- Fixed crashes in SpatialReference with non-ASCII characters.
https://github.com/django/django/pull/6757 - Fixed #26744 -- Fixed a typo in regex for Accept-Language header parsing.
Reviews of core dev work
------------------------
https://github.com/django/django/pull/6731 - Fixed #26712 -- Avoided unnecessary SET TIMEZONE queries on PostgreSQL.
https://github.com/django/django/pull/6669 - Fixed #26677 -- Made some i18n tests use a disposable filesystem tree.
https://github.com/django/django/pull/6747 - Refs #26677 -- Simplified i18n test cleanups.