bug in QUnit with type errors in number arguments

[davidnich]

ex:

Unexpected exception: RUNTIME-OVERLOAD-ERROR at /Users/david/src/qore/git/qore/qlib/QUnit.qm:980
-----
	>> System exception: /Users/david/src/qore/git/qore/qlib/QUnit.qm:980: RUNTIME-OVERLOAD-ERROR: no variant matching '<value>::toString(integer) can be found; the following variants were tested:
	>>    <value>::toString()
	>> call stack:
	>>   Test::printUnexpectedData() called at /Users/david/src/qore/git/qore/qlib/QUnit.qm:1329 (user function)
	>>   Test::assertEq() called at ./reflection.qtest:500 (user function)
	>>   ReflectionTest::reflectionTests() called at /Users/david/src/qore/git/qore/qlib/QUnit.qm:450 (user function)
	>>   call_function_args() called at /Users/david/src/qore/git/qore/qlib/QUnit.qm:450 (builtin function)
-----

The error is at QUnit.qm:978:

978:                switch (act.typeCode()) {
979:                    case  NT_NUMBER:
980:                        expected = sprintf("(%s) %N (%s)", exp.type(), exp, exp.toString(NF_Raw));
981:                        break;