Thanks Mariusz Felisiak, Tim Graham, and Adam Johnson for review.

Unused since 5008a4db.

BaseModelAdmin.get_fields() was previously unused/untested.

Additionally, a test has been updated to account for small SRS WKT differences.
Thanks Tim Graham for writing the doc part.

Fixed #28104 -- Prevented condition decorator from setting ETag/Last-Modified headers for non-safe requests.

Thanks Tim Graham for the review.

Model.pk was added after _get_pk_val() and many places weren't simplified.

Thanks Tim Graham for the review.

Fixed #28262 -- Fixed incorrect DisallowedModelAdminLookup when a nested reverse relation is in list_filter.

e.g. ResourceWarning: unclosed <socket.socket [closed] fd=6, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6>

Fixed #28269 -- Fixed Model.__init__() crash on models with a field that has an instance only descriptor.

Regression in d2a26c1a.

Python 3's SimpleCookie treats all values as strings. Passing a bytes
object coerces to the repr value.

Unused since its introduction in 79e68c22.

Thanks Tim Graham for noticing the issue.