Good realization. We were already using Map/Set polyfills in our apps so didn't notice the cost as much. I imagine it should be possible to polyfill with a much

Good realization. We were already using Map/Set polyfills in our apps so didn't notice the cost as much. I imagine it should be possible to polyfill with a much smaller footprint; maybe we can find another to recommend. As Dan notes Map+Set polyfills are also not needed in newer browsers.