“By the way, one of these codebases [Vanilla WoW] is extremely buggy, and we had already solved a lot of those [bugs]. But we can’t solve them [this time around] because... ‘reasons’ if we’re thinking about the Classic timeline. And so we really struggled with it for a very long time, and one of the things that we talked about when we were discussing different ways to do it was to do what’s called a ‘fork.’ So we did a fork of our existing modern server stack and then reimplemented the systems that we needed to support Classic WoW. And made sure that the tuning was right and imported the old data, we had the old code and a way to compare. Having the backend tools, and the backend server, and the modern hardware was a requirement to realize this project.” Essentially, what the team did, was teach modern WoW to speak old Classic data.

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