t (ASCII) integer to character</span>

    (<span class="kw">char=?</span> c1 c2)                      <span class="co">; #t is c1 and c2 are the same character</span>
    (char&lt;? c1 c2)                      <span class="co">; comparison of characters after conversion to integer</span>
                                        <span class="co">; etc.</span>

    (<span class="kw">char-ci=?</span> c1 c2)                   <span class="co">; case insensitive comparison</span>
                                