isosphere

/// Returns the largest highly composite number less than or equal to the given number.
/// There is nothing clever about this algorithm, it is slow.
/// # Arguments
/// * `maximum` - A reference to a number that the highly composite number must not exceed
/// # Examples
/// ```
/// assert_eq!(highest_highly_composite_number(&842), 840)
/// ```
fn highest_highly_composite_number<'a, T: 'a>(maximum: &T) -> T 
where