Check the contents of dictionary view annotations - #573
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KeysView, ValuesView and ItemsView had no checkers registered, so they fell through to a plain isinstance and their arguments were dropped: KeysView[int] accepted a view over string keys, and ItemsView[int, str] accepted the exact reverse of what it asked for. The views are checked elementwise like the other collections, and ItemsView follows check_mapping in reporting the key and the value separately.
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KeysView, ValuesView and ItemsView have no checkers registered, so their arguments get dropped:
The views are checked elementwise like the other collections. ItemsView follows check_mapping in reporting the key and the value separately