[mypyc] Document some of our inheritance conventions #19370
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Our policy wasn't clear from just reading the code.
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| This makes it possible to use isinstance(x, <concrete Value | ||
| subclass>) checks without worrying about potential subclasses. |
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Would it be a good idea to mark the concrete classes as @final to document/enforce this?
On a somewhat related noted, can/does mypyc optimize isinstance checks with final types?
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Our policy wasn't clear from just reading the code.