class_docstr: A stateless singleton that proxies `st.session_state` interactions
  to the current script thread's SessionState instance.
  
  The proxy API differs slightly from SessionState: it does not allow
  callers to get, set, or iterate over "keyless" widgets (that is, widgets
  that were created without a user_key, and have autogenerated keys).
docstr: Iterator over user state and keyed widget values.
docstr_tok: ["Iterator","over","user","state","and","keyed","widget","values","."]
code: def __iter__(self) -> Iterator[Any]:
      """Iterator over user state and keyed widget values."""
      # TODO: this is unsafe if fastReruns is true! Let's deprecate/remove.
      return iter(get_session_state().filtered_state)
  
imports: from typing import Any, Dict, Iterator, MutableMapping
  from typing_extensions import Final
  from streamlit import logger
  from streamlit import runtime
  from streamlit.runtime.metrics_util import gather_metrics
  from streamlit.runtime.state.common import require_valid_user_key
  from streamlit.runtime.state.safe_session_state import SafeSessionState
  from streamlit.runtime.state.session_state import SessionState
  from streamlit.type_util import Key
label_desc: Use image node_id 1 for calling the SessionStateProxy obj's underlying member method code with example usage: obj.__iter__() and returns: iter