Improve reduce perf

0-reduce.js

var when = require('../../../when');

var a = [];
for(var i=0; i<1000000; ++i) {
	a[i] = when.resolve(i);
}

var start = Date.now();
when.reduce(a, add, 0).done(function(r) {
//when.reduceRight(a, add, 0).done(function(r) {
	console.log('when.reduce', Date.now() - start, r);
});

function add(x,y) {
	return x + y;
	//return when.resolve(x + y);
}

1-improve-reduce-perf.js

when.reduce 998 499999500000

2-master.txt

when.reduce 2114 499999500000