Iterator

        pub const Iterator = struct {
            keys: [*]K,
            values: [*]V,
            len: u32,
            index: u32 = 0,

            pub fn next(it: *Iterator) ?Entry {
                if (it.index >= it.len) return null;
                const result = Entry{
                    .key_ptr = &it.keys[it.index],
                    .value_ptr = &it.values[it.index],
                };
                it.index += 1;
                return result;
            }

            /// Reset the iterator to the initial index
            pub fn reset(it: *Iterator) void {
                it.index = 0;
            }
        }