Function length

test/33.database.aggregate.js:65–65

	});
	it('should throw an exception if step.length or inverse.length is invalid', function () {
		const length = x => Object.defineProperty(() => {}, 'length', { value: x });
		expect(() => this.db.aggregate('a', { step: length(undefined) })).to.throw(TypeError);
		expect(() => this.db.aggregate('b', { step: length(null) })).to.throw(TypeError);
		expect(() => this.db.aggregate('c', { step: length('2') })).to.throw(TypeError);