`pyjlcallback` not defined?

[MilesCranmer]

In PySR unittests I'm getting the following issue when trying to upgrade to juliacall 0.9.16 (in this PR)

     File "/home/runner/work/PySR/PySR/pysr/sr.py", line 1626, in _run
        bin_constraints=jl_array(bin_constraints),
                        ^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/runner/work/PySR/PySR/pysr/julia_helpers.py", line 33, in jl_array
        return jl_convert(jl.Array, x)
               ^^^^^^^^^^^^^^^^^^^^^^^
      File "/opt/hostedtoolcache/Python/3.12.2/x64/lib/python3.12/site-packages/juliacall/__init__.py", line 21, in convert
        _convert = PythonCall.seval("pyjlcallback((T,x)->pyjl(pyconvert(pyjlvalue(T)::Type,x)))")
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/runner/.julia/packages/PythonCall/F4kmJ/src/JlWrap/module.jl", line 25, in seval
        return self._jl_callmethod($(pyjl_methodnum(pyjlmodule_seval)), expr)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    juliacall.JuliaError: UndefVarError: `pyjlcallback` not defined

It seems that juliacall.convert is broken.

---

(Probably a good motivation to add #461 to make sure more of the API is covered by testing)

[cjdoris]

Ah thanks, what a dumb bug (introduced by the refactor). Fixed on main, plus I've added tests for more of juliacall, and making a release now.

[MilesCranmer]

Thanks!!