class_docstr: Runtime configuration options.
  
  Attributes
  ----------
  initialize : bool
      Automatic MPI initialization at import (default: True).
  threads : bool
      Request initialization with thread support (default: True).
  thread_level : {"multiple", "serialized", "funneled", "single"}
      Level of thread support to request (default: "multiple").
  finalize : None or bool
      Automatic MPI finalization at exit (default: None).
  fast_reduce : bool
      Use tree-based reductions for objects (default: True).
  recv_mprobe : bool
      Use matched probes to receive objects (default: True).
  irecv_bufsz : int
      Default buffer size in bytes for ``irecv()`` (default = 32768).
  errors : {"exception", "default", "abort", "fatal"}
      Error handling policy (default: "exception").
docstr: Update options.
docstr_tok: ["Update","options","."]
code: def __call__(self, **kwargs):
      """Update options."""
      for key in kwargs:
          if not hasattr(self, key):
              raise TypeError(f"unexpected argument {key!r}")
      for key, value in kwargs.items():
          setattr(self, key, value)
  
label_desc: Use image node_id 3 for calling the Rc obj's underlying member method code with example usage: obj.__call__() without return types