Reported by Nat Dunn on docs@

PyUnicode_AsEncodedString() instead of calling the encode() method of the
host, to handle correctly custom string with an encode() method which doesn't
return a byte string. The encoder of the IDNA codec is now called directly
instead of calling the encode() method of the string.

Patch from Shiyao Ma.

Patch by Elvis Pranskevichus.

Initial patch by Larry Hastings.

Patch by Elvis Pranskevichus

It was very much outdated, and the topic is better covered elsewhere.

(About the only new feature that was worth mentioning in
whatsnew without a NEWS entry)