lexible manner. We would like to verify that all arguments are of the correct type, and only then
unwrap them and assign them to C variables. The C API provides a number of utility functions that both typecheck
and unwrap values in one operation, making this boilerplate a bit more natural.
</p>
<p>These utility functions will have the signature <code class="mendoza-code">type janet_get##type(const Janet *argv, int32_t n)</code>, and
extract the nth argument passed to <code class="mendoza-code">argv</code> w