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I believe that the paragraph starting "There is only one empty
list..." on page 13, section 6.2 of R3RS should be modified.  In MIT
Scheme, the statement that

(eqv? "" "") ==> #t

is actually false, because there is a user operation,
`set-string-length!', which distinguishes between two empty strings.
I think that the same might be true of #() in an implementation with

The statement should be modified to indicate that it is true given the
operations described in the report, and may not be true in a given
implementation with extended operations.