[DarrenLehane]

I assume English is not his first language, as he also just made a job posting (http://news.ycombinator.com/item?id=2422799) which has the same errors such as "din't".

[sukuriant]

din't is easily a sticky key or a fast-typing error. It happens to any of us and doesn't necessarily say that the person has a separate first language.

Furthermore, even though it's good form to read over a message you're sending and remove the typoes, grammar-os and other such issues, it doesn't always happen :)

[dwwoelfel]

It's too consistent to be a typo. It appears twice in the article, twice in one of his comments here and once in his job posting.