Index

    pub const Index = enum(u32) {
        root = 0,
        _,

        pub fn toOptional(i: Index) OptionalIndex {
            const result: OptionalIndex = @fromBackingInt(@intCast(@backingInt(i)));
            assert(result != .none);
            return result;
        }

        pub fn toOffset(base: Index, destination: Index) Offset {
            const base_i64: i64 = @backingInt(base);
            const destination_i64: i64 = @backingInt(destination);
            return @fromBackingInt(@intCast(destination_i64 - base_i64));
        }
    }