Function normally

test/42.integrity.js:24–24

	const allowed = fn => () => expect(fn).to.not.throw();
	const blocked = fn => () => expect(fn).to.throw(TypeError);
	const normally = fn => fn();
	const whileIterating = (self, fn) => {
		let count = 0;
		for (const _ of self.iterator.iterate()) { count += 1; fn(); }