675   function arrayReduce(array, iteratee, accumulator, initAccum) {  argument
679     if (initAccum && length) {
700   function arrayReduceRight(array, iteratee, accumulator, initAccum) {  argument
702     if (initAccum && length) {
910   function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {  argument
912       accumulator = initAccum
913         ? (initAccum = false, value)
9679           initAccum = arguments.length < 3;
9681       return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
9708           initAccum = arguments.length < 3;
9710       return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);