| This is a real headache. To be frank, controlling lazy evaluation and | sharing to get the right complexity for your code can be hard enough at | the best of times, without the compiler sometimes ignoring the sharing | you try to ask for... Yes, I agree. The trade off is that without the hack all programs go a bit slower, and I don't know how to fix that. I have not measured this effect recently; maybe it's small. Thanks for updating the ticket with more info; v helpful S