Add index key support for wp_list_pluck(), à la array_column().

props trepmal.
fixes #28666.

Built from https://develop.svn.wordpress.org/trunk@28900


git-svn-id: http://core.svn.wordpress.org/trunk@28699 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add documentation for the default playlist shortcode attributes in `wp_playlist_shortcode()`.

Props taylorde.
Fixes #28678.

Built from https://develop.svn.wordpress.org/trunk@28901


git-svn-id: http://core.svn.wordpress.org/trunk@28700 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Notify developers when register_post_type() or register_taxonomy() fails because of post type or taxonomy key length.

props mattheweppelsheimer.
fixes #28683.
Built from https://develop.svn.wordpress.org/trunk@28902


git-svn-id: http://core.svn.wordpress.org/trunk@28701 1a063a9b-81f0-0310-95a4-ce76da25c4cd