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This adds a
#[pyclass(mapping)]
option, to disable the sequence-slot-flling behaviour introduced in PyO3 0.16 (#2065).This is helpful in cases where you want to implement a mapping, because having the sequence slots filled in that case is simply incorrect.
I didn't add
#[pyclass(sequence)]
because the it wouldn't do anything - to implement sequence slicing the mapping slots have to be used anyway.