Overloaded type annotations not compiled by Sphinx

[tp832944]

What's the problem?

We have used the overload decorator to provide more specific type hints in several places, e.g. in kernels.ScalarValuedKernel, but these are not rendered by Sphinx. Instead, Sphinx just shows the generic Union of several possible types. Moreover, if we rely on overload with class inheritance, no annotations are compiled at all, e.g. kernels.scalar_valued.SquaredExponentialKernel.compute_elementwise.

overload with class inheritance should work as of Python 3.12 - I'm unsure about earlier Python versions. Sphinx issues from a few years ago (pre-Python 3.12) also suggest this should work.

How can we reproduce the issue?

Compile documentation and look at classes mentioned above.

Python version

3.12

Package version

0.2.1

Operating system

Windows

Other packages

No response

Relevant log output

No response