Using the function arguments

• convert_to_long(arg1);
• convert_to_double(arg1);
• convert_to_string(arg1);
• convert_to_boolean_long(arg1);
• convert_string_to_number(arg1);

For type:
IS_STRING use arg1->value.str.val
IS_LONG       arg1->value.lval
IS_DOUBLE     arg1->value.dval