Assume print-readably and print-circle are t, and that you have a hash
table that refers to the same object from 2 different buckets.
If the object is not a string (e.g., a list), then printing the hash
table will preserve the eq relationship. But if the object is a string,
the eq relationship is lost.
See
http://list-archive.xemacs.org/pipermail/xemacs-beta/2013-June/024194.html
for details.
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