Function format_with_e

compiler/src/modules/vm/handlers/format.rs:247–260

(mag: f64, prec: usize, upper: bool)

}

fn format_with_e(mag: f64, prec: usize, upper: bool) -> String {
    // Rust emits "3.14e0"; expects "e+00", inject the sign and pad exponent to >=2 digits.
    let raw = alloc::format!("{:.*e}", prec, mag);
    let (mant, exp_str) = raw.split_once('e').unwrap_or((raw.as_str(), "0"));
    let (esign, edigs) = if let Some(rest) = exp_str.strip_prefix('-') { ('-', rest) }
    else { ('+', exp_str) };
    let mut out = String::new();
    out.push_str(mant);
    out.push(if upper { 'E' } else { 'e' });
    out.push(esign);
    if edigs.len() < 2 { out.push('0'); }
    out.push_str(edigs);
    out
}

fn require_float(v: Val, heap: &HeapPool) -> Result<f64, &'static str> {
    if v.is_float() { return Ok(v.as_float()); }