Reverted test for refs #27603 in favor of using FuncTestMixin.

Thanks Greg Larmore for report and initial patch.

Thanks Adam Johnson and Tim Graham for the reviews.

Thanks Brent Hand for the initial patch.

Unused since 2bab9d6d.

This reverts commit 550cb3a3
because try/except performs better.

As of ccbba981, both examples don't use
a join.

Moved boilerplate from docs to a method.

Refs #23919 -- Replaced usage of django.utils.functional.curry() with functools.partial()/partialmethod().

Unused since 3adc5f1e.

deque() isn't needed since algorithm doesn't require FIFO.

Fixed #11557 -- Added support for a list of fields in Meta.get_latest_by and QuerySet.earliest()/latest().

Fixed #28555 -- Made CharField convert whitespace-only values to the empty_value when strip is enabled.

This is a security fix.