lib/modules/check.js
function checkValue (val, expectedType, name) {
	if (typeof val !== expectedType) {
		throw new Error(name + ' must return ' + expectedType);
	}
	return Utils;
}
function checkValue (val, expectedType, name) {
	if (typeof val !== expectedType) {
		throw new Error(name + ' must return ' + expectedType);
	}
	return Utils;
}
/* Utils.check.value();
Utils.check.fn();
Test typeof of a returned value
or of a single value