, threads use the two
tables <code class="mendoza-code">make-image-dict</code> and <code class="mendoza-code">load-image-dict</code>. This means you can
send over core bindings, even if the underlying value cannot be marshalled.
Semantically, messages sent with <code class="mendoza-code">(thread/send to msg)</code> are first converted
to a buffer via <code class="mendoza-code">(marshal msg make-image-dict mailbox-buf)</code>, and then
unmarshalled by the receiving thread via <code class="mendoza-code">(unma