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Issue: EQUAL-STRUCTURE (Version 5)

Some months back, John Rose made a suggestion that two hashtables should
only be considered "equivalent" (for constant coalescing purposes) if
there are equal on a component-by-component basis; _and_ where component
indexing is by the set of hash-table keys.  Several people (including
myself) supported this view, even though it makes descent into hash
tables a bit more complex than descent into simpler structures.

-- JonL --