code: public static ContractLongCondition conditionL(
      final LongPredicate condition,
      final LongFunction<String> describer)
    {
      return ContractLongCondition.of(condition, describer);
    }
docs: Construct a {@code long} specialized predicate from the given predicate
  function and describer.
  
  @param condition The predicate function
  @param describer The describer
  
  @return A predicate