Inconsistency between code and comment

[YichiZhang0613]

In geoarrow-rs/rust/geoarrow/src/array/mixed/array.rs, the comment indicate the code panics if offset + length >= self.len() while the code will panic if offset + length < self.len()

/// # Panic
///
/// This function panics iff `offset + length >= self.len()`.
#[inline]
pub fn slice(&self, offset: usize, length: usize) -> Self {
    assert!(
        offset + length <= self.len(),
        "offset + length may not exceed length of array"
    );

In geoarrow-rs/rust/geoarrow/src/array/util.rs, the comment indicate the code panics if index >= self.len() while the code will panic if index >= self.len() -1

impl<O: OffsetSizeTrait> OffsetBufferUtils<O> for OffsetBuffer<O> {
    /// Returns the length an array with these offsets would be.
    #[inline]
    fn len_proxy(&self) -> usize {
        self.len() - 1
    }

    /// Returns a range (start, end) corresponding to the position `index`
    ///
    /// # Panic
    ///
    /// Panics iff `index >= self.len()`
    #[inline]
    fn start_end(&self, index: usize) -> (usize, usize) {
        assert!(index < self.len_proxy());
        let start = self[index].to_usize().unwrap();
        let end = self[index + 1].to_usize().unwrap();
        (start, end)
    }