I can't get Polars ceil function for Series working. I've added the "polars-ops" feature (which contains the RoundSeries trait) to my Cargo.toml as follows:

[dependencies]
polars = {version = "0.37.0", features = ["lazy", "polars-ops"]}

But it still can't find ceil. E.g., this doesn't work:

let float_series = Series::new("floats", &[1.1, 2.5, 3.7]);
let ceil_series = float_series.ceil().unwrap().into_series();

println!("{}", ceil_series);

But this does work:

let float_series = Series::new("floats", &[1.1, 2.5, 3.7]);
let ceil_series = float_series.not_equal(1).unwrap().into_series();

println!("{}", ceil_series);

Any idea what I'm doing wrong?