Improve String.prototype.startsWith polyfill - #554

Strange indentation on these lines.

Also, is the check for search really needed? The common case is that search is provided and if it is falsey it will fail on the toString check anyway.

        if (this == null || $toString.call(search) == '[object RegExp]') {
          throw TypeError();
        }

I wanted to avoid the toString.call whenever possible for performance reasons, but yeah, in the common case it won’t make a difference. I’ll make the change.

You could probably skip it in the common case by doing one of.

1. typeof
2. Compare the searchString to search