Thanks Tom Christie for review.

This fixes django-taggit and reflects some places where duck-typing may not
be appropriate.

This reduces the possibility of a naming conflict, especially after
squashing migrations.

Thanks Tim for the review and pointing out this was fixed by #26207.

Refs #26572, #17281. The RFC doesn't limit total length, just the line length
which is already taken care of by Python itself.
Thanks Tim Graham for the review.

Didn't rename django.utils.feedgenerator.rfc2822_date()
as some external code may rely on it.

Refs #26536.

Thanks Sylvain Fankhauser for the very detailed report.

Calling conditional_escape() on SafeData won't change it.

Thanks to Andriy Sokolovskiy for initial patch.

Useful for overriding the DateTimeField widget.

The WGS84 proj string can differ depending on installed libs.
Refs #26592.

Thanks Michael Bitzi for the reporti and Tim Graham for the review.

On Python 3, sending emails failed for addresses containing non-ASCII
characters due to the usage of the legacy Python email.utils.formataddr()
function. This is fixed by using the proper Address object on Python 3.