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Aiming to resolve #652
I'm not (yet) quite convinced if this is the way to go; would really like to get some discussion going on how to approach this and eventually get this fixed and merged.
Implementation of arrow functions in filters:
Object manipulation is not really supported; this implementation accepts a arrowFunction (Twig syntax) which is compiled and parsed as a new (runtime) template. The return values (e.g. output) of the arrowFunction are delegated to their respective JS functions.
As previously stated: this is merely a functional (read dirty) workaround; but for most of the use cases it will do the trick.