Function group_size

compiler/src/modules/vm/handlers/format.rs:304–306

'_' groups binary/octal/hex every four digits; decimal and ',' every three.

(ty: u8, sep: u8)

// '_' groups binary/octal/hex every four digits; decimal and ',' every three.
fn group_size(ty: u8, sep: u8) -> usize {
    if sep == b'_' && matches!(ty, b'b' | b'o' | b'x' | b'X') { 4 } else { 3 }
}

fn add_grouped(digits: &str, group: usize, sep: u8) -> String {
    let mut out = String::with_capacity(digits.len() + digits.len() / group);