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re: Concerning "EQ but not EQUAL"...

    Is a CL implementation in error if it implements EQUAL by returning T if
    the arguments are EQ, as a performance hack?

The buzz words "EQ but not EQUAL" imply calling EQUAL at two different 
times; the altered item (which remains EQ to itself) is no longer EQUAL
to the "platonic" original version.

-- JonL --