Commits on Nov 29, 2017

1. Avoid repeated String#slice calls in stringDistance. …

   The `stringDistance` function calls
   
   ```js
   strA.slice(0, -1)
   ```
   
   and
   
   ```js
   strB.slice(0, -1)
   ```
   
   multiple times, which is a bit of a waste of time here. JavaScript
   engines cannot generally eliminate the duplicated calls easily, so
   it's better to avoid the redundant calls altogether.
   
   This improves the chai test on the
   [web-tooling-benchmark](https://github.com/v8/web-tooling-benchmark) by
   around 8% when run with upcoming V8 6.4.

   

   bmeurer committed Nov 29, 2017
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