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a thread label by way of a `ByteArray#` containing a UTF-8-encoded string.
The old `GHC.Conc.Sync.labelThread` is now implemented in terms of this
function.
+ * `GHC.Conc.Sync.threadLabel` was added, allowing the user to query the label
+ of a given `ThreadId`.
## 4.17.0.0 *TBA*