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jansel avatar jansel commented on May 24, 2024

Aren't function defaults immutable? If the default value is a ConstantVariable I think we can not guard on it. Though we should still guard if is something that could be mutated.

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anijain2305 avatar anijain2305 commented on May 24, 2024

Someone could still override the dunder defaults altogether. As shown in the example above. Unlikely but possible.

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ezyang avatar ezyang commented on May 24, 2024

This is the kind of thing where I kind of hope dict hooks would have been enough. Maybe that CPython API is not available here though...

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anijain2305 avatar anijain2305 commented on May 24, 2024

Just to point out, the guard itself is pretty cheap. Its the accessor which is expensive here. So, dict hooks (I am guessing you mean dict versions/tags) wont be enough.

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