gh-119180: Add VALUE_WITH_FAKE_GLOBALS format to annotationlib by JelleZijlstra · Pull Request #124415 · python/cpython
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There is no meaningful value to return for VALUE_WITH_FAKE_GLOBALS; it's only useful within an annotate function.
Concretely, raising an exception here means that if a user-provided annotate function delegates to an API in annotationlib without further thought, it will raise an exception for VALUE_WITH_FAKE_GLOBALS, which is what we'd want.