This sounds very familiar. I bet I'll find that the handler (count_up) is called using MULTICALL. The last time I looked at it, I hypothesised that MULTICALL is an optimization used to speed up calling a function repeatedly by reusing stack frames, and that it fails when a lexical is still referenced when it goes out of scope.

In reply to Re: Odd lexical variable behavior -- why does this happen? by ikegami
in thread Odd lexical variable behavior -- why does this happen? by radiantmatrix

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