When trying to run this with the newest version there are multiple errors

lib/untis.dart:242:25: Error: Members can't be declared to be both 'final' and 'var'. Try removing the keyword 'var'. final var hour = time.substring(0, 2); ^^^ lib/untis.dart:243:25: Error: Members can't be declared to be both 'final' and 'var'. Try removing the keyword 'var'. final var minute = time.substring(2, 4); ^^^ lib/untis.dart:403:29: Error: Non-nullable variable 'bestForenameMatches' must be assigned before it can be used. return _SearchMatches._(bestForenameMatches, bestSurnameMatches); ^^^^^^^^^^^^^^^^^^^ lib/untis.dart:403:50: Error: Non-nullable variable 'bestSurnameMatches' must be assigned before it can be used. return _SearchMatches._(bestForenameMatches, bestSurnameMatches); ^^^^^^^^^^^^^^^^^^

As HttpClient is not compatible with web. (It is throwing an error.) We should switch to either just the http package or to the dio package. The disadvantage of pure http package being, that you cant specify badCertificateCallback there. DIO is capable of that(I think).
My question is, why this paragraph exists in the first place.