Data

Data; it's structure, formatting and storage.

Large Uint

We can treat any piece of data as a large unsigned int. The efficient encoding of a large unsigned int is to encode the length as a header:

 [1]*0[10]*

The number of 1's (L) indicates the data length. The length is ((1<<(L-1))+1, with an exception that L==0 is 1. I think there's a better formula, but I haven't found it yet. This has several advantages.