Echo JS 0.11.0

> It differs from classnames in that it does not accept variable arguments.

Can't that be allowed with one line change? It would basically be a drop-in replacement.

I assume this is where some of the performance gains comes from. JS engines create `arguments` on-demand when needed, it's expensive (relative to just passing in an array).

http://webreflection.blogspot.ie/2010/02/arguments-callee-call-and-apply.html

Coo. Here is in action
https://sequential.js.org/live.html#DYewhgJgFA5AFgFwQBwM4C4D0mCuA7ZAawHMA6AYxAFtNzgxVUB3AJzGRgEoBuAKEryoQwAKalQxKHQbM2yKACIAZiBAKANAAIFAIzAsN2vQC8FnHkA