Add additional arity to the ex-handler [core.async]

Question

I find it limiting that ex-handler for async/pipeline(-blocking) accepts an exception only, but not the value for which that exception occurred. Another arity (fn [ex v]) would be useful for use cases such as retrying, better error reporting etc. I guess it could be supported in a backward-compatible way via reflection arity checking (e.g. https://stackoverflow.com/a/1813967).

Answer 1

This is a duplicate of an existing question/ticket:

• https://ask.clojure.org/index.php/349/allow-second-arity-channel-handler-which-takes-well-throwable
• https://clojure.atlassian.net/browse/ASYNC-114