"mandatory" null validation is not working

[mvorisek]

See

data/tests/FieldTest.php

Line 924 in 1c5c361

$m->set('c', null); // @TODO even "b"/mandatory field should fail!

b/mandatory field should throw when null is set like the c/required field there.

As confirmed by @DarkSide666, the set() method is expected to fully normalize/validate the field at the time of setting the value (ie. immediatelly as required does).

Considering this as a Major as this is core functionality and many developers may rely on that.

[mvorisek]

Related with #576 , as the currently implementation does not even work as defined, fixing this issue will break the BC anyway, so it should be not fixed and full refactoring like analysed and proposed in #576 should be done.