pytype: ignore some signature mismatch in configitems pytype is grumpy about the dict.update having a more complex signature than the one we use here. pytype error: itemregister: Overriding method signature mismatch [signature-mismatch] Base signature: 'def builtins.dict.update(self) -> None'. Subclass signature: 'def itemregister.update(self, other) -> Any'. Parameter 'other' must have a default value.

pytype: only output the "pytype crashed" message on error If pytype did not crash while generating stub, that message is kind of confusing. It seems simple enough to avoid it in this case.

pytype: drop the now useless assert As the imported types are now used by type annotation, these ugly assert are no longer needed.