Added stumpless_element_to_string benchmark #375

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cbfe354) 90.48% compared to head (e019ae4) 90.48%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## latest #396 +/- ## ======================================= Coverage 90.48% 90.48% ======================================= Files 46 46 Lines 4160 4160 Branches 553 553 ======================================= Hits 3764 3764 Misses 273 273 Partials 123 123 ```

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[goatshriek]

Thanks very much for putting this together! It looks great!