[red-knot] Minor fix in intersection type comment#14176
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carljm
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sharkdp
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Nov 7, 2024
| // | ||
| // However, we do have to leave out the negative contributions. If we were to | ||
| // add a contribution like ~f(N1), we would potentially infer result types | ||
| // that are too narrow, since ~f(A) can be larger than f(~A). |
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It's better not to talk about the size of ~f(A). We should rather compare f(A & ~B) with f(A) & ~f(B). The former can be larger (bool) than the latter (Literal[True]), as demonstrated in the example below.
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Yes, this is the part I was having the hardest time thinking through clearly
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The fully worked example makes it much clearer
carljm
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Summary
Minor fix in intersection type comment introduced in #14138