Avoid memory leak for thread-local values #1320
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Setting the thread-local value to `null` is not the same as removing it. The former retains an entry mapping the current thread's value to `null` in a hidden global map. The latter removes the current thread's entry entirely.
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Setting a thread-local value to
nullis not the same as removing it. The former retains an entry mapping the current thread's value tonullin a hidden global map. The latter removes the current thread's entry entirely.