The symptoms sound like you are running into a case where there are multiple protocol branches that apply - this is a case where the behavior is undefined and can vary between JVM executions.
Looks like it's going down the seq reduce path. I'm not at a computer to check more precisely what the other preferred option might be. I think there's actually an open ticket about a similar case. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.