Bug in simplification of String.words and String.lines

[w0rm]

String.words "" or String.lines "" actually return [""], not an empty list. It is not intuitive, but it is what it is 😄

elm repl
---- Elm 0.19.1 ----------------------------------------------------------------
Say :help for help and :exit to exit! More at <https://elm-lang.org/0.19.1/repl>
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> String.lines ""
[""] : List String
> String.words ""
[""] : List String