The guaranteed variance originates in the “why”(enclosing social system’s culture, social practices, …) reflected in the “how” (expressed implementation or accent), not the “what”(intention - indicating a verbatim quotation). https://hachyderm.io/@danderson/113411709745533765
@dahukanna@adapalmer used these conventions to great effect in her Terra Ignota series to indicate which language a quoted character is currently speaking.