I happen to like Carp so much that I rewrote it to make it better, but try as it might it cannot always properly assign blame. In this case it reaches all of the way up the call stack, gives up, and gives a complete stack backtrace. If your code appeared in a module, you'd have blamed the user with a very confusing message.
By contrast the anonymous hash always blames the exact right line of code.
While I have preferred the flat list approach, I'm going to have to rethink that preference based on this point.
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