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This makes the logic work out just fine. You can see the implementation here: https://github.com/sbcl/sbcl/blob/master/src/assembly/x86-64/arith.lisp
Code wise it requires either a ton of code, or a whole bunch of macros. I used the latter approach (see here). Even after optimising this, you'll still end up with a bucket of extra code/macros.
The source code of the bigInteger library is at GitHub. There is also an alternate library that is based on GMP. As far as I know GMP uses special casing for small numbers internally.
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