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ljojiasdf

Can you re-read please?

https://peps.python.org/pep-0544/#:~:text=Structural%20subty....

> substituted-for class to be defined as a protocol.

... which is false

> Similarly, the heading on the dictionary says “for a fixed set of keys” — but what if I want a dynamic heterodox dict? Eg, unpacking JSON.

You can quite obviously decode to recursive types (e.g. using pydantic), not sure what the problem is.