splitting: adding split1-when-slice and split-when-slice.
benchmark.splitting: adding a splitting benchmark.
splitting: add split*-when-slice and change to not use make.
hints: should hint on split not split,
splitting: adding split-slice and split*-slice for completeness.
math.parser: faster using byte-arrays.
math.parser: do two digits down until 10.
stack-checker: remove a test that is no longer valid, need to replace it with something.