lshift/cloverage — pull request #11 by JacekLach (2013-01-23 15:41:05+00:00)
Title: Use atoms instead of refs

Covering expressions that are contained in a transaction will *reuse* outer transaction - thus something like

```clojure
(dosync
(throw RuntimeException. "WOOPS"))
```

will never be marked as covered, since the thrown exception aborts the transaction and rolls back our updates to the coverage store.