ring_of_opt"><a href="#val-string_of_opt" class="anchor"></a><code><span class="keyword">val</span> string_of_opt : <span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> string)</span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> option</span> <span>&#45;&gt;</span> string</code></dt><dt class="spec value" id="val-bit_size"><a href="#val-bit_size" class="anchor"></a><code><span class="keyword">val</span> bit_size : int <span>&#45;&gt;</span> int</code></dt><dt class="spec value" id