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visible hash tables

    Date: Mon, 16 May 88 23:51:57 PDT
    From: Jon L White <edsel!jonl@labrea.stanford.edu>

    Incidentally, both you and Touretzky forgot that hash-tables have two
    additional interesting properties beyond the :type and :size -- the
    :rehash-size and :rehash-threshold.  Hash-tables wouldn't be fully
    reconstructable from the printed format unless this information were
    also included.

That's not an unprecedented flaw.  Arrays have a number of properties
that are not represented in their printed representations, such as
adjustability, fill pointer, and element type.