fix mapChildren and use a better data driven impl on swap rows now that it doesn't suck
fix mapChildren and use a better data driven impl on swap rows now that it doesn't suck

krausest/js-framework-benchmark,krausest/js-framework-benchmark,krausest/js-framework-benchmark,krausest/js-framework-benchmark,krausest/js-framework-benchmark,krausest/js-framework-benchmark