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There aren't many possible approaches. The more complex variants of globals caches try to also speedup writes, which is IMO a waste of time since rebinding globals is not a good coding practice, and especially not in the middle of time-critical loops.
(by the way, the patch only addresses normal functions, but generators would easily benefit from a similar treatment)
And Skip is right that this would be most useful when paired with a JIT (allowing for aggressive specialization, and possibly inlining).