Add List.reverse [ a ] --> [ a ]

[lue-bird]

sort, sortBy, sortWith already have a simple check for returning the list unchanged when it's a singleton list.

List.reverse [ a ]
--> [ a ]

-- not shown in summary
List.reverse (List.singleton a)
--> List.singleton a

-- not shown in summary
List.reverse << List.singleton
--> List.singleton

[jfmengels]

We can do the same for String.reverse when we see String.reverse (String.fromChar c)