static CloseableItIt mapLike mapI_notNulls_closeable(final O f, final CloseableItIt i) {
  ret notNulls_closeableIterator(mapI_closeable(f, i));
}

static <A, B> CloseableItIt<B> mapI_notNulls_closeable(CloseableItIt<A> i, IF1<A, B> f) {
  ret mapI_notNulls_closeable(f, i);
}