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The variadic arguments are passed by reference where possible. A shallow copy (with data linked for referable objects) is made before and used for traversal (so that data seen by the called function is what existed when the traversal began).
void m_vcall(mint m, object o, integer p, &...);
calls the function indicated by o for each element in the m integer set, with the unnamed arguments and the element position inserted in position p in between the unnamed arguments