pub(crate) fn safe_slice_to_pos(content: &str, pos: usize) -> &str {
    let pos = pos.min(content.len());
    let mut boundary_pos = pos;
    while boundary_pos > 0 && !content.is_char_boundary(boundary_pos) {
        boundary_pos -= 1;
    }
    &content[..boundary_pos]
}