Cleaning in ICallable + changed fingerprint to plain char array to allow for dead object examination + additional check in FetchContext callback to avoid the unexplained rogue callbacks I have seen + protection in LoaderStateMachine::HandleSuccessMessage in case things go wrong anyway

mergeInto(LibraryManager.library, {
  WasmDelayedCallExecutor_Schedule: function(callable, timeoutInMs/*, payload*/) {
    setTimeout(function() {
      window.WasmDelayedCallExecutor_ExecuteCallback(callable/*, payload*/);
    }, timeoutInMs);
  }
});