``HttpRequest.build_absolute_uri()`` now correctly handles paths starting with ``//``.
``WSGIRequest`` now doesn't remove all the leading slashes either,
because ``http://test/server`` and http://test//server`` aren't the same thing
(RFC2396).

Thanks to SmileyChris for the initial patch.

Thanks santiagobasulto for the suggestion.

Prevented unlimited memory consumption when running background tasks
with DEBUG=True.

Thanks Rob, Alex, Baptiste, and others.

sphinx 1.2+ adds this text itself.

Fixed #20550 -- Added keepdb argument to destroy_test_db

Fixes #22605, #22735; also lays the ground for some other fixes.

Fixed #22725 - Migration.run_before does nothing

Forward-port of c9aedce0 from stable/1.7.x.

Forward-port of 1238f92c from stable/1.7.x.

Thanks Florian for the bug report, luyikei for the initial code patch, and
Bouke for the code review feedback.

This prevents silent data loss.

Thanks Aymeric Augustin for the initial patch and Loic Bistuer for the review.

Thanks clime for the report.

Previously this was conflated with another Oracle-specific behavior.

Several database backends struggle with binary data. This change
minimizes the risk of unrelated tests failures when binary fields
trigger errors.

Forward-port of 2e4bcb9b from stable/1.7.x.

This allows these tests to run on databases that reject duplicate NULL
values in unique fields e.g. SQL Server.

Forward port of 4fb50a9a from stable/1.7.x.

Thanks smeaton for report and Joël Rochat for spell check

Thanks django at patjack.co.uk.

Thanks peterbe for the report.

Thanks danielsamuels for the report

Thanks David Fischer for the report and Moayad Mardini for the
review.

Unicode method on model should return unicode

The example of a __unicode__ model method should return a unicode value
instead of a string.

Thanks Daniel Pope for the suggestion.

Thanks Rudolph for the report.