The "Ruby" label for this article is rather misleading. It doesn't talk at all about implementation, rather just calling into a library, which is written primarily in C anyway.
Why ever not? If you're writing an application in Ruby, you're going to need the fastest algorithms on the block to make up for the interpreter's less than optimal performance. I would think that Ruby (and other dynamic script languages) need this type of technique more than just about any other environment.
