Arbitrary size?

[Ten0]

Does this support arbitrary size integers? From a quick look at the source code it looks like it does.
If that is indeed the case, it might be better to use that word instead of "big" in most places and at least in the readme/description of the lib, as it's much more precise and descriptive. (For the same reason BTreeMap is called BTreeMap and not Map, and HashMap is called HashMap and not UnorderedMap.)
This would make it so that people don't have to go look at the source code to ensure how it behaves.

[cuviper]

It seems reasonable to establish up front that "big" means "arbitrary size", but I don't think we need to avoid "big" throughout.