WeakReference in WatchingCache

[darkleaf]

Is it possible remove WeakReference usage or add generic WatchingCache?
JavaScript engine does not implement WeakReference but implement WeakMap.

For clojurescript support #20

[camsaul]

Yeah, we can make that Clojure-only with #?(:clj). If it's not there it's not the end of the world in a web application.

[camsaul]

See #72. I think we should just replace the watching cache altogether