check_passed out parameter for assert_equal()

[cmarqu]

In my own package, I have a procedure very similar to assert_equal(), and I recently found that I am missing an out parameter (type boolean or an enum with elements pass/fail) called something like "check_passed" that I can then use later on. Maybe you could consider that for libv as well (ideally with wrapper procedures that don't have "check_passed" for more concise code when not needed).