bd7aed4b12
When the Python iterator backing `PyIterator` has a `__length_hint__` special method, we can use this as a lower bound for Rust's `Iterator::size_hint` to e.g. support pre-allocation of collections. This is implemented using `PyObject_LengthHint` which is not available in the stable ABI and hence so is `Iterator::size_hint`. This should be fine since this is an optimization in any case and the stable ABI is expected to have slightly worse performance overall. |
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