Goggles, questions about the numeric rankings

I’ve started looking at the Goggles system.

I have two questions that I didn’t find answered in the documentation that I’ve read.

  1. What are the underlying rankings on top of which Goggle re-ranking is applied. Are results ranked by real numbers or integers? What is the range of values that they can take? What typical distribution do those ratings / ranking-numbers have, for a specific search?

  2. The sample Goggle definitions, I’ve look at, have integer reranking offsets. I believe these can go up to 10 and presumably to -10. Can those numbers be defined as reals, like 5.72, rather than integers?