John Cowan <cowan@mercury.ccil.org> writes:

> The problem with that is that "pointer" is an implementation-level
> notion, not a user-level notion.  From a user perspective, `eq?` is
> a fast version of `eqv?` that you can safely use on certain types
> and not others.  While location tags formalize `eqv?`, there is no
> counterpart for `eq?` at all.  Its behavior is horridly arbitrary, about
> the furthest thing possible from that famous hard, gem-like beauty that
> Scheme is supposed to have.

Why can location tags not be used to formalize eq? as well?

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