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Scheme BNF

    Date: Thursday, 27 March 1986  14:41-EST
    From: Jonathan A Rees <JAR at MC.LCS.MIT.EDU>

    I guess I would propose for EQ? to act on immutable data the same
    way it does on procedures, remembering where they came from but
    maybe returning false for things that are operationally
    equivalent.  EQV?  would test for true operational equivalence in
    the case of immutable data.

I think that this is a good idea.  If strings are immutable, I don't
see why EQ? should be required to compare their contents.