getSlotByKey

        fn getSlotByKey(self: Self, key: anytype, ctx: anytype, header: *IndexHeader, comptime I: type, indexes: []Index(I)) ?usize {
            const slice = self.entries.slice();
            const hashes_array = if (store_hash) slice.items(.hash) else {};
            const keys_array = slice.items(.key);
            const h = checkedHash(ctx, key);

            const start_index = safeTruncate(usize, h);
            const end_index = start_index +% indexes.len;

            var index = start_index;
            var distance_from_start_index: I = 0;
            while (index != end_index) : ({
                index +%= 1;
                distance_from_start_index += 1;
            }) {
                const slot = header.constrainIndex(index);
                const slot_data = indexes[slot];
                if (slot_data.isEmpty() or slot_data.distance_from_start_index < distance_from_start_index)
                    return null;

                const i = slot_data.entry_index;
                const hash_match = if (store_hash) h == hashes_array[i] else true;
                if (hash_match and checkedEql(ctx, key, keys_array[i], i))
                    return slot;
            }
            unreachable;
        }