This bug was of the major reasons for the release.

Adding missing docs for DynamicClassAttribute by copying the docstring.  The
doc entry could stand some expansion, which I will note on the issue.

Jason doced the change in the constructor *method* description, but
not the description of Request.method, so I added the change there
as well.

Also some fixups in the docs.

Also fix issue number in address sanity check entry.

Including the subsequent line re-wrapping.

Patch by Sean Rodman.

str.encode, bytes.decode and bytearray.decode now use an
internal API to throw LookupError for known non-text encodings,
rather than attempting the encoding or decoding operation and
then throwing a TypeError for an unexpected output type.

The latter mechanism remains in place for third party non-text
encodings.

Backported changeset d68df99d7a57.

Patch by Arfrever Frehtes Taifersar Arahesis.

Patch by Arfrever Frehtes Taifersar Arahesis.

Original patches by A. Kuchling and G. Rees (#12691).