Use lines instead of split

```
% cat ~/bench-split.yml
prelude: |
  s = "foo\nbar\nbaz\n"
benchmark:
  '/(?<=\n)/': |
    s.split(/(?<=\n)/)
  '/^/': |
    s.split(/^/)
  'lines': |
    s.lines
Warming up --------------------------------------
           /(?<=\n)/   459.123k i/s -    467.844k times in 1.018994s (2.18μs/i)
                 /^/   467.922k i/s -    469.744k times in 1.003894s (2.14μs/i)
               lines     2.343M i/s -      2.424M times in 1.034677s (426.84ns/i)
Calculating -------------------------------------
           /(?<=\n)/   422.347k i/s -      1.377M times in 3.261232s (2.37μs/i)
                 /^/   477.603k i/s -      1.404M times in 2.939186s (2.09μs/i)
               lines     2.485M i/s -      7.028M times in 2.828757s (402.47ns/i)

Comparison:
               lines:   2484631.6 i/s
                 /^/:    477603.3 i/s - 5.20x  slower
           /(?<=\n)/:    422346.5 i/s - 5.88x  slower
```

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