Iterator

        pub const Iterator = struct {
            index: usize = 0,
            values: *[Indexer.count]Value,

            pub fn next(self: *Iterator) ?Entry {
                const index = self.index;
                if (index < Indexer.count) {
                    self.index += 1;
                    return Entry{
                        .key = Indexer.keyForIndex(index),
                        .value = &self.values[index],
                    };
                }
                return null;
            }
        }