Buggy. Inserted 5 words but only 3 words were inserted.

[spam0115]

I inserted "cats","dog","sand","and","cat" but only cats, dogs, and sand were inserted.

[episage]

import { RBTree } from 'bintrees'

let tree = new RBTree((a, b) => a.localeCompare(b));
["cats", "dog", "sand", "and", "cat"].forEach(animal => {
  tree.insert(animal);
});

tree.each(v => {
  console.log(v);
})

node index.js 
and
cat
cats
dog
sand