public void TryGetSingle_WithNonEmptyEnumerableAndTautologicalLambda_ExpectsFalse()
 => False(ENMRBL_EMPTY.TryGetSingle(DefaultDelegates.ContradictionalLambda <MultiItems>(), out _));
 public void TryGetSingle_WithEmptyEnumerable_ExpectsFalse()
 => False(ENMRBL_EMPTY.TryGetSingle(DefaultDelegates.TautologicalLambda <MultiItems>(), out _));