Sign up process UX improvement

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The sign up process is pretty missed up, I used a username and said taken, yet sent me a confirmation link for it? Also, I really don’t like when the site doesn’t actively check the username availability unless you send the form.. at least don’t reset the password field!
Copied this from different author from a HackerNews comment at https://news.ycombinator.com/item?id=39319549