code: public void setParamsToRuntimeCheck(
        ImmutableMap<String, Predicate<String>> paramsToRuntimeCheck) {
      checkState(this.paramsToRuntimeCheckByDelegate == null);
      this.paramsToRuntimeCheckByDelegate = checkNotNull(paramsToRuntimeCheck);
    }
docs: Sets the params that require runtime type checking for each possible delegate target.
  
  <p>This mechanism is used by the TOFU runtime only to save some work when calling templates.