`task_local_storage`, why and where?

General Usage
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I recently discovered that there exists such function as task_local_storage for task. It’s exported. Can anyone give me an example of practical application of such functionality?

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For example, I just used it in DecFP.jl to make the rounding mode thread-safe: Thread safety: per-task state rather than per-thread by stevengj · Pull Request #185 · JuliaMath/DecFP.jl · GitHub

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Thanks for both references. Based on them I was able to build an intuition on how task_local_storage can be used.

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