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Between new features, old bugs fixed, and new bugs introduced, there were various releases of ASDF in the wild, and no simple way to check which release had which feature set. People using or writing systems had to either make worst-case assumptions as to what features were available and worked, or take great pains to have the correct version of ASDF installed.
With ASDF 2, we provide a new stable set of working features
that everyone can rely on from now on.
#+asdf2 to detect presence of ASDF 2,
(asdf:version-satisfies (asdf:asdf-version) "2.345.67")
to check the availability of a version no earlier than required.