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> If I use the antimark prescription to follow what happens, and compare > identifiers using both marks and antimarks, I indeed get the correct result #f. > However, the text of the SRFI does not describe antimarks as essential to the > semantics, but rather as an implementation strategy. Good point. The antimarks are essential given how bound-identifier=? is supposed to operate. I will rewrite the description so that it doesn't imply that the antimarks are an optional part of the operational description. Kent