Nerdbank.GitVersioning and the Revision number

I love using the NerdBank.GitVersioning CLI tool nbgv. It completely removes the need to think about an aspect of a
project that doesn't add any value to your customers. But today I realized I understood the first three parts of the
version produced by nbgv, but the fourth "revision" component was not obvious. Turns out it is a uint16 value of the
first two bytes of the commit id!