pub const Iterator = struct {
    inner: BitSet.Iterator(.{}),
    values: *[Indexer.count]Value,

    pub fn next(self: *Iterator) ?Entry {
        return if (self.inner.next()) |index|
            Entry{
                .key = Indexer.keyForIndex(index),
                .value = &self.values[index],
            }
        else
            null;
    }
}