alloc_value
*val_out = alloc_value(&null_type, 0);
*val_out = alloc_value(&null_type, 0);
b = alloc_value(&bool_type, 1);
*val_out = alloc_value(&array_type, sizeof(struct k5_json_array_st));
*val_out = alloc_value(&object_type, sizeof(struct k5_json_object_st));
s = alloc_value(&string_type, len + 1);
n = alloc_value(&number_type, sizeof(long long));