Browser compatibility [1], array handling instead of just single elements, chainability and flexibility come high up in my list. These are important mainly when

Browser compatibility [1], array handling instead of just single elements, chainability and flexibility come high up in my list. These are important mainly when there are several elements and not just one. [1] https://github.com/umbrellajs/umbrella/blob/master/src/plugins/filter/filter.js https://github.com/umbrellajs/umbrella/blob/master/src/plugi...