Remove usage of AsPyPointer in traits for convergint to PyObject

[alex]

Refs #3358

[alex]

I'm not sure if a changelog is actually required here.

[alex]

Pretty convinced it does not: Unless a user manually implements PyNativeType, all implementations will have both AsPyPointer and also AsRef<PyAny> (or be PyAny). Therefore, excluding that (unlikely) situation, this will not have any user visible impact.

[davidhewitt]

Personally I'd still prefer to see this documented. I think "Replace AsPyPointer with AsRef<PyAny> as a bound in the blanket implementation of From<&T> for PyObject" is enough.

[davidhewitt]

Aside from that, I'm pretty certain this is the right solution to this one, nicely done 👍

I had wondered if we'd need to remove the blanket implementation and add concrete implementations in the macros in types/mod.rs, which would have been more breaking.

[alex]

Okey doke. Done.

[davidhewitt]

Thanks!