Proposal: Add newUniqueSTM to Data.Unique

[Sebastian Fischer]

>
> Alternately, since bug #3838 has been resolved, we could revert to using an
> IORef
>

Are there advantages of using STM now that bug #3838 does not need to be
worked around? Would it be worthwhile to have both IO and STM interfaces for
unique identifiers so those who want them in STM don't need to use an unsafe
function?

Sebastian
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