- new => [">v2.0" => "Unavailable before readline version 2.1 (1997)."],
- ext => ["bash" => "Default assignment in Bash shells, but not common readline."],
+ 'v21 new' => [">v2.0" => "Unavailable before readline version 2.1 (1997)."],
+ 'xbash ext' => ["bash" => "Default assignment in Bash shells, but not common readline."],