memory footprint of readRDS()

The ratio of object size to rds file size depends on the object.  Some
variation is due to how header information is stored in memory and in the
file but I suspect most is due to how compression works (e.g., a vector of
repeated values can be compressed into a smaller file than a bunch of
random bytes).

f <- function (data, ...)  {
    force(data)
    tf <- tempfile()
    on.exit(unlink(tf))
    save(data, file = tf)
    c(`obj/file size` = as.numeric(object.size(data)/file.size(tf)))
}

memory footprint of readRDS()

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