Document fragility of hDuplicateTo
Summary
Using GHC.IO.hDuplicateTo in a concurrent setting can cause some unpredictable failures. I don't think there's anything we can do about this, but we can at least document it. Related to #16819 (closed)
Using GHC.IO.hDuplicateTo in a concurrent setting can cause some unpredictable failures. I don't think there's anything we can do about this, but we can at least document it. Related to #16819 (closed)