Investigate switching from pybind11 to nanobind

[cqc-alec]

It seems nanobind is a more modern alternative to pybind11 (from the same original developer), with similar syntax but better performance and support for stable ABI (for Python 3.12+).

[CalMacCQ]

Would this have any implications for the cpp files which are used as source material for the sphinx docs? Sphinx doesn't always play nicely with some of the syntax in these files.

[cqc-alec]

Would this have any implications for the cpp files which are used as source material for the sphinx docs? Sphinx doesn't always play nicely with some of the syntax in these files.

It would certainly have implications for the binder source files. I don't think sphinx directly processes these. Can you give an example?