`checking` should avoid value-or-exception logic

[frenchy64]

Suggested: #67 (comment)

test.check has boolean values to check if a testing run has succeeded. checking uses the more crude (legacy?) check of whether the return is an exception.

[frenchy64]

It seems like value-or-exception logic is baked into the internals of test.check for spec compatibility. I can't see a use case where using :pass? or :result-data instead of :result would change any reporting.

https://github.com/clojure/test.check/blob/c05034f911fa140913958b79aa51017d3f2f4426/src/main/clojure/clojure/test/check/properties.cljc#L32-L37