`never_is_true` wrongly passes if it is true

[godmothersfire]

function tests.never_is_true()
	check(typeof(a) == "boolean", "expect() value must be boolean")
	return if a then tests else fail()
end

But it should be:

function tests.never_is_true()
	check(typeof(a) == "boolean", "expect() value must be boolean")
	return if not a then tests else fail()
end