While doing some debugging on issue44459 using Python 3.10b3, I was using Pdb and after troubleshooting an exception and hitting 'q' to quit, I saw the following:

```
(Pdb) q
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/pdb.py", line 1709, in main
    pdb._runmodule(mainpyfile)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/pdb.py", line 1541, in _runmodule
    mod_name, mod_spec, code = runpy._get_module_details(module_name)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/runpy.py", line 146, in _get_module_details
    return _get_module_details(pkg_main_name, error)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/runpy.py", line 110, in _get_module_details
    __import__(pkg_name)
  File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/pip-run-w0xovt3h/rinoh/__init__.py", line 41, in <module>
    from . import resource
  File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/pip-run-w0xovt3h/rinoh/resource.py", line 205, in <module>
    from .template import DocumentTemplate
  File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/pip-run-w0xovt3h/rinoh/template.py", line 42, in <module>
    from .stylesheets import sphinx
  File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/pip-run-w0xovt3h/rinoh/stylesheets/__init__.py", line 42, in <module>
    .format(stylesheet.description, stylesheet))
  File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/pip-run-w0xovt3h/rinoh/style.py", line 670, in __str__
    for name, entry_point in self.installed_resources:
  File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/pip-run-w0xovt3h/rinoh/resource.py", line 54, in installed_resources
    for entry_point in ilm.entry_points()[cls.entry_point_group]:
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/metadata/__init__.py", line 979, in entry_points
    return SelectableGroups.load(eps).select(**params)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/metadata/__init__.py", line 437, in load
    ordered = sorted(eps, key=by_group)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/metadata/__init__.py", line -1, in <genexpr>
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/metadata/_itertools.py", line 16, in unique_everseen
    k = key(element)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/metadata/__init__.py", line 600, in _normalized_name
    return Prepared.normalize(self.name)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/metadata/__init__.py", line 841, in normalize
    return re.sub(r"[-_.]+", "-", name).lower().replace('-', '_')
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/re.py", line 187, in sub
    return _compile(pattern, flags).sub(repl, string, count)
TypeError: expected string or bytes-like object

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/pdb.py", line 1738, in <module>
    pdb.main()
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/pdb.py", line 1730, in main
    pdb.interaction(None, t)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/pdb.py", line 357, in interaction
    self._cmdloop()
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/pdb.py", line 322, in _cmdloop
    self.cmdloop()
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/cmd.py", line 138, in cmdloop
    stop = self.onecmd(line)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/pdb.py", line 422, in onecmd
    return cmd.Cmd.onecmd(self, line)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/cmd.py", line 217, in onecmd
    return func(arg)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/pdb.py", line 1118, in do_quit
    self.set_quit()
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/bdb.py", line 358, in set_quit
    self.stopframe = self.botframe
AttributeError: 'Pdb' object has no attribute 'botframe'. Did you mean: 'curframe'?
```

I'd not seen this error before, so I suspect there may be a regression in 3.10. I haven't investigated further, but I wanted to register this possible issue.