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I think some people do either end up not using slime, or not using sbcl’s ext:save-lisp-and-die to save and resume their universe lisp image core when they are using slime. When you should use both.
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Good points.
I'll make a weaker statement.
You don't _have_ to use them.
Your mode of operation will vary.
But you must make an __informed__ decision whether to use them or not.