- var search = String(searchString);
- return nativeStartsWith
- ? nativeStartsWith.call(that, search, index)
- : that.slice(index, index + search.length) === search;
+ var search = toString(searchString);
+ return un$StartsWith
+ ? un$StartsWith(that, search, index)
+ : stringSlice(that, index, index + search.length) === search;