Range indexing into an `AnnotatedStrings` gives a `SubString` instead of a copy

[KristofferC]

julia> Base.AnnotatedString("1 + 2")[1:2] |> typeof
SubString{Base.AnnotatedString{String}}

julia> String("1 + 2")[1:2] |> typeof
String

julia> @view(String("1 + 2")[1:2]) |> typeof
SubString{String}