Hello, thanks for your report. It is indeed failing to build, due to a newer version of mypy that fails.
I suspect this is actually an issue with mypy, See this example NONETYPE = type(None) def f(a) -> None: if type(a) == NONETYPE: pass I will contact the mypy upstream about this. But I intend to make a typedload update to workaround this. Best -- Salvo Tomaselli "Io non mi sento obbligato a credere che lo stesso Dio che ci ha dotato di senso, ragione ed intelletto intendesse che noi ne facessimo a meno." -- Galileo Galilei http://ltworf.github.io/ltworf/