Why can't you join this with the else clause below? AFAICT the only thing that is different is the type of `rem`: ```d static if (static if (is(Unqual!T == uint)) alias T = long; else alias T = int; ```

What about the documentation table above?

Please also test that the result is equal to `x0 % BigInt(uint.max)` and `-x0 % BigInt(uint.max)`.