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=== Comments (feel free to delete) === * Is it possible to set default values for threads where the IOParam was not set? :: I'm not sure what this means. You can set a value to ''undefined'' or ''error ...''. You can change the default for a group of threads by setting up new values with ''withIOParam'' and then forking threads from this context. * Is it possible to have a value in TLS that is not Typeable? :: No, but I think everything should be ''Typeable''. * Would the idea be to use unsafePerformIO to create the Uniques for top-level keys? :: Please clarify.
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