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This happens a lot more often than you think, since most addon authors aren't professional programmers with years of experience, and even then it happens. "Upgrading" libraries the old LibStub way is very complicated and if you messed up in some old version of it, it will cause unexpected and unfixable bugs for years, since the old version won't just disappear in most cases. Using the new facilities that the game offers, ensures that only one version of the addon is loaded into memory, which avoids this problem entirely.
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