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Description
Continued from https://github.com/PyO3/pyo3/pull/3197#discussion_r1225910628
We would like to ensure that we're consistent in how conversions from Python objects to Rust objects select for what's allowed.
I think the right approach would be to do something like https://github.com/PyO3/pyo3/blob/main/guide/src/conversions/tables.md where for each Rust type we state what Python types will convert to it (i.e. FromPyObject), and what Python type(s) it will convert back into (i.e. IntoPy<PyObject>).
That information does live on that page, but perhaps it can benefit from being rearranged.
In general we seem to be preferring conversions which are allow the user to be a bit loose with typing (e.g. string for IP address). So I think we should ensure we stick to this philosophy everywhere (e.g. maybe we should accept int for bool, or even all truthy types)?
We may also wish to consider a "strict" mode where only the exact Python type can be input (e.g. Python bool <-> Rust bool).