rlang and tibble are not explicitly required. Conversions to tibble happens with dplyr::tibble().
The data attributes of sf objects are returned now as tibble, for easy printing in console.
Improvements in code and tests.
Now sf objects can handle correctly nested fields provided in the json response (for example, the nested address field provided by the API). This is consistent also with the results provided by the non-spatial functions, were unnesting was already handled correctly.