sp;754.
</p>
<li><p>For implementations that support a distinct -0.0, the semantics
of many arithmetic operations with regard to -0.0 has been specified
consistently with IEEE&nbsp;754.
</p>
<li><p>Scheme&#8217;s real number objects now have an exact zero as their imaginary part.
</p>
<li><p>The specification of <tt>quasiquote</tt> has been extended.  Nested
quasiquotations work correctly now, and <tt>unquote</tt> and <tt>unquote-splicing</tt> have been extended to several operands.
</p>
<li><p>Procedures n