ASDF uses CHANGE-CLASS because (1) it caches a system's identity before it's defined (2) re-loading can cause changehttps://twitter.com/juhosnellman/status/625712153891315713 …
They are both features of the CLOS MOP. ASDF relies on U-I-F-R-C when it is upgraded and its internals changed. @duncanmak
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U-I-F-R-C is a feature of live systems that remain up as change happens, as opposed to dead systems that restart from scratch every time.
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As usual, CL's "let's side-effect the one true (local) world" semantics feels low-level. Yet so much higher-level than cult-of-dead systems.
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