emacs.d/clones/www.sbcl.org/sbcl-internals/Reader-and-Printer.html
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<h3 class="section">9.2 Reader and Printer</h3>
<p>The <code>"</code> reader macro always constructs an object of type
<code>(simple-array character)</code>, even if all of the characters within
the quotation marks are of type <code>base-char</code>. This implies that
only strings of type <code>(vector character)</code> will be able to be
printed when <code>*print-readably*</code> is true: attempting to print
strings of other types will cause an error of type
<code>print-not-readable</code>.
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