> When a procedure is redefined, existing calls may or may not be affected;
> (Anybody have problems with these?)

Yes!  If I redefine a procedure (including, btw, primitives) I want the new
version to apply everywhere, including already-loaded code.  This is a
requirement for interactive debugging.

(I think I understand why you're saying no for macros, but it makes me sad.
It's not very jewel-like to have different redefinition rules for different
kinds of things.  It makes the language that much harder to learn.)

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