documentcloud/underscore — comment on commit ed4826ca19bafb2b9ec6aba3f34ec7edafc05d40
File: underscore.js line 1018
By jdalton:

Which version of opera do u support?
Because originally before I caught the fail in Opera 9.25 I had

~~~ js
unshift.call(arguments, this._wrapped);
return result(func.apply(_, arguments), this._chain);
~~~

which avoids a slice.