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If noone is using this variable (or switch), over time, I may submit a patch to remove it (not right away, but in the far future :-)).
This is not urgent of course, but when running a tool on the Squeak VM ("link analysis of runtime interfaces") it flags the withSpy variable as interesting because it is declared and defined in two places.
And if it is not really used (at all) then there's no point in doing that.
David Stes