Function _isNotFalse

src/gsap-core.js:37–37

	_isUndefined = value => typeof(value) === "undefined",
	_isObject = value => typeof(value) === "object",
	_isNotFalse = value => value !== false,
	_windowExists = () => typeof(window) !== "undefined",
	_isFuncOrString = value => _isFunction(value) || _isString(value),
	_isTypedArray = (typeof ArrayBuffer === "function" && ArrayBuffer.isView) || function() {}, // note: IE10 has ArrayBuffer, but NOT ArrayBuffer.isView().