
  [;1m-spec iolist_size(Item) -> non_neg_integer()[0m
  [;1m                     when Item :: iolist() | binary().[0m

  Returns an integer, that is the size in bytes, of the binary that
  would be the result of [;;4miolist_to_binary(Item)[0m.

  For example:

    > iolist_size([1,2|<<3,4>>]).
    4
