Function _polars_plugin_atan 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn _polars_plugin_atan(
    e: *mut SeriesExport,
    input_len: usize,
    kwargs_ptr: *const u8,
    kwargs_len: usize,
    return_value: *mut SeriesExport,
    context: *mut CallerContext,
)