This will help large integer counters type fields that increment by
small amounts over time. Instead of storing the larger raw value
in a compressed format, we store the difference from the prior value
in compressed format which allows the value to be stored using
fewer bits.
Will make it less error-prone to add new encodings int the future
since each encoder has it's set of constants. There are some placeholder
contants for uncompressed encodings which are not in all encoder currently.
Jason Wilder
Ben Johnson
Paul Dix