pub(crate) fn transpose_codepoints_in_range(
    text: &str,
    distance: i32,
    range_start: u32,
    range_end: u32,
) -> String {
    debug_assert!(range_start <= range_end);
    debug_assert!(i64::from(range_start) + i64::from(distance) >= 0);
    debug_assert!(i64::from(range_end) + i64::from(distance) <= i64::from(u32::MAX));

    text.chars()
        .map(|c| {
            let codepoint = c as u32;
            if range_start <= codepoint && codepoint <= range_end {
                std::char::from_u32(codepoint.strict_add_signed(distance)).unwrap_or(c)
            } else {
                c
            }
        })
        .collect()
}