format.info() is used in no CRAN package (except in lists of known
functions) and nowhere in R itself so I think you could do whatever you
wanted by way of extending it. However, I don't think it going to be
easy, as apart from scientific those arguments are handled via
postprocessing by prett
The format.info() function currently takes args (x, digits = NULL,
nsmall = 0), while format.default() takes many more:
function (x, trim = FALSE, digits = NULL, nsmall = 0, justify = c("left",
"right", "centre", "none"), width = NULL, na.encode = TRUE,
scientific = NA, big.mark = "",
