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Raymond's important and high up enough that he probably only needs the approval of three AIs and five managers to publish a blog - updating documentation likely needs twice that.
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the blog says the documentation improvement was made in 2020? presumably not by the post author either
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From the article:

> The documentation should open with something like this:

>> The callback function must perform its work quickly without blocking. If you need to do complex work or synchronize with other threads or processes, do the work asynchronously, such as by using System Worker Threads.

A change was made, but not the change that Raymond thinks would explain why the list is there anyway.

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He used his blog to queue the work to be executed asynchronously by another MS worker that reads it
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And, since he isn't waiting on the reply, he is following the rule for the callback.
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Always been that way
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