code: public Datatype.Builder mutateStandardMethodUnderrides(
        Consumer<? super Map<StandardMethod, UnderrideLevel>> mutator) {
      // If putStandardMethodUnderrides is overridden, this method will be updated to delegate to it
      mutator.accept(standardMethodUnderrides);
      return (Datatype.Builder) this;
    }
docs: Invokes {@code mutator} with the map to be returned from {@link
  Datatype#getStandardMethodUnderrides()}.
  
  <p>This method mutates the map in-place. {@code mutator} is a void consumer, so any value
  returned from a lambda will be ignored. Take care not to call pure functions, like {@link
  Collection#stream()}.
  
  @return this {@code Builder} object
  @throws NullPointerException if {@code mutator} is null