Logically missing inverse of assert.ok()

[Bartvds]

There doesn't seem to be a the negation (inverse?) for the assert() style ok() assertion.

assert.notOk(value);

Of course it's possible to use a different tests, which have same effect but they break the symmetry and descriptiveness when you have things that need to be ok and others need to be not-ok.

//Test for falsy
assert.ok(!myValue);
assert.isTrue(!myValue);
assert.isFalse(!!myValue);
assert.equals(myValue, false);
//..more

It's so glaring omission, is there a reason not to have it?