rum.core/derived-atom without docs about rum HOT 5 CLOSED

Please provide a PR :)

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When I'm already messing around with this particular fns metadata, would you accept that I add indentation metadata as well, so that emacs (and eventually, hopefully, other editors) indent it like:

  (def *x (derived-atom [*a *b] ::key
            (fn [a b]
              (str a \":\" b))))

instead of the current

(def *x (derived-atom [*a *b] ::key
                      (fn [a b]
                        (str a \":\" b))))

from rum.

sure

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PR provided :)

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Thanks! Closed in #85

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