Function check_position_range 

pub fn check_position_range(
    path: &str,
    start: usize,
    end: usize,
    size: usize,
) -> ArgumentResult<Range<usize>>

Validates a half-open range of boundary positions.

start and end are valid when start <= end <= size. Equal endpoints are accepted and produce an empty range. On success, this function returns the validated start..end range.

Errors

Returns ArgumentErrorKind::IndexRange when start exceeds end or when end exceeds size.