Catching specific exception types via error_already_set

If I want to perform the C++ equivalent of this python code:

try:
    val = d['key']
except KeyError:
    return

I can do it like this, but it's rather verbose:

py::object val;
try {
  val = d["key"];
} catch (py::error_already_set& exc) {
  exc.restore();
  if (PyErr_ExceptionMatches(PyExc_KeyError)) {
    PyErr_Clear();
    return;
  } else {
    throw py::error_already_set();
  }
}

Is there a more idiomatic way to do this? If not, could we modify the type hierarchy and/or the error_already_set mechanism to allow for something closer to this?

py::object val;
try {
  val = d["key"];
} catch (const py::key_error& exc) {
  return;
}

The issue names error_already_set, PyErr_ExceptionMatches, and PyExc_KeyError but no files or tests. Start by tracing the existing exception mechanism and its tests, then define the supported typed-catching behavior and verify that KeyError handling remains distinct from other Python exceptions.