How does the MOO pass arguments to builtin functions?
The argument list is represented in the same way as all MOO values; in this case, it is a MOO list containing all of the arguments passed to the built-in function by the MOO programmer. First, I’ll describe MOO value representation in general; after that I’ll get back to built-in function argument lists in particular. MOO values are represented by C structures of type `Var’. There are two members of such a structure, the `type’ and the value, `v’. The `type’ member is one of TYPE_NUM, TYPE_OBJ, TYPE_ERR, TYPE_STR, or TYPE_LIST. This type corresponds exactly to the MOO programmer’s idea of the standard five MOO data types. The particular `type’ value used in each instance determines the form of the `v’ or value member of the structure; `v’ is a union of a number of different representations, one for each type. If x.type == TYPE_NUM, then x represents a MOO number, the value of which is found in x.v.num (a C integer). The TYPE_OBJ and TYPE_ERR cases are handled similarly, representing MO
