If "fast" is what makes people adopt immutable data structures, awesome. I'm glad even if its for the wrong reasons as they come with many other benefits. We've

If "fast" is what makes people adopt immutable data structures, awesome. I'm glad even if its for the wrong reasons as they come with many other benefits. We've all been using immutable strings in JS for quite a while without much troubles - why not use immutable objects and lists too?