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Another problem with python’s type annotations is that false negatives are common in partially type annotated code bases: i.e. an annotation which is untrue, but for which there are no supporting calls/usages causing the type checker to reject it. This is pretty pathological in my experience: it means that annotations have the semantic status of comments (i.e. might be true, might not, who knows) while being given the syntactic status of “real code”.



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