This depends on whom or what you are exposing this function for. If an end-user who manually makes use of this function, it is not a problem, but if the function is te be used by code that expects a consistent data-type, it is not acceptable. We have agreed on disabling the return of a character vector with the projection options (and only showing them in an error message), which completely disables retrieving these values (except for copy pasting). A future new function should re-enable this (ideally, as part of a function that retrieves all possible highdim concepts and their projections).