s="mdzsyn-operator">)</span><span class="mdzsyn-operator">;</span>

<span class="mdzsyn-comment">/* Mutable optional types specify a size default, and
 * construct a new value if none is provided */</span>
<span class="mdzsyn-identifier">JanetBuffer</span> <span class="mdzsyn-operator">*</span><span class="mdzsyn-identifier">janet_optbuffer</span><span class="mdzsyn-operator">(</span><span class="mdzsyn-keyword">const</span> <span class="mdzsyn-identifier">Janet</span> <span class="mdzsyn-operator">*</span>