Triaged
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https://code.djangoproject.com/ticket/27931 - Clarify the meaning of "django catch-all logger" (accepted)
https://code.djangoproject.com/ticket/27937 - Potential issue with field.queryset._result_cache persisting (reopened ticket that caused the regression)
https://code.djangoproject.com/ticket/27940 - Migrations fail when when a model's parent class is changed to abstract -- Wrong SQL being generated (duplicate)
https://code.djangoproject.com/ticket/27947 - Document that model field error_messages don't carry over to forms (accepted)
https://code.djangoproject.com/ticket/27946 - Improve "ValueError: Found wrong number of constraints" error message (accepted)
https://code.djangoproject.com/ticket/27954 - Prevent PostgreSQL dbshell from exiting on CTRL-C (accepted)
https://code.djangoproject.com/ticket/27955 - JSONField.default not applied in admin (invalid)
https://code.djangoproject.com/ticket/27956 - In DEBUG interface, the section "error during template rendering" doesn't go inside an included template (duplicate)
Authored
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https://github.com/python/cpython/pull/661 - bpo-27657: Fix urlparse() with numeric paths
https://github.com/django/django/pull/8178 - Refs #27563 -- Fixed ModelChoiceField.__deepcopy__() so forms don't share a queryset cache.
https://github.com/django/django/pull/8184 - Fixed #27948 -- Removed incorrect unquote() in static serving views.
https://github.com/django/django/pull/8199 - Fixed #27939 -- Updated OpenLayersWidget.map_srid for OpenLayers 3.
https://github.com/django/django/pull/8210 - Fixed #27890 -- Fixed FileNotFound cleanup exception in runtests.py on Python 3.6+.
Reviewed/committed
------------------
https://github.com/django/django/pull/8166 - Fixed #27918 -- Documented ChoiceWidget.option_template_name
https://github.com/django/django/pull/8120 - Fixed #27882 -- Allowed {% cache %} to cache indefinitely.
https://github.com/django/django/pull/8148 - Fixed #27897 -- Fixed crash with 'pk' in ModelAdmin.search_filters.
https://github.com/django/django/pull/8171 - Fixed #27935 -- Fixed crash with BrinIndex name > 30 characters.
https://github.com/django/django/pull/8209 - Fixed #27724 -- Fixed SelectDateWidget redisplay if a year isn't chosen.