Mentionning real-time queue

[Arthur-Milchior]

Reading about queue, and your sentence mentionning that it would require traversing the sequence of nodes, I felt slightly bad. I love Okasaki's work and feel like honesty requires to note that this is not a requirement. We can keep the beauty of functional-programing, the simplicity of having a simple data structure that just contains values and unmutable pointers, and still be efficient; even in the worst-case.

As it's clearly not-relevant for the remaining of the book, I limited myself to a single paragraph and a link.

Disclaimer: I'm linking to a part of a wikipedia article I wrote.