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1b1ed1a
(Get the code!)
In the bad old days of ASDF1, the few implementations that provided ASDF each provided their own patched version.
In the days of ASDF2, they all provide a baseline release, except when an urgent patch was required - but return to mainline at next release while mainline quickly merges in the patch. So it's only a matter of how current your ASDF is - don't use something older than what your implementation provides; something newer is encouraged if you need it.
ECL is an exception in that it also loads asdf-bundle (nee asdf-ecl) when you (require "asdf"). This tends to defeat quicklisp, but I'll fix that by merging asdf-bundle into asdf.
Yes, you can prevent Quicklisp from loading a bad ASDF simply by loading yours first. If you're using ECL, you should also load asdf-bundle immediately afterwards.