he most laborious task is safely converting Janet values into C types in a safe
and flexible 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)</c