It currently only inserts separators into `usize`s, because that's all that has been needed so far. `-Zmacro-stats` will need `isize` and `f64` handling, so this commit adds that.
It currently only inserts separators into `usize`s, because that's all that has been needed so far. `-Zmacro-stats` will need `isize` and `f64` handling, so this commit adds that.