put method Null safety
override
Implementation
@override
void put(String dataId, Map<String, dynamic>? value) => _valueStream.add(
Map.from(_valueStream.value)..addAll({dataId: value}),
);
@override
void put(String dataId, Map<String, dynamic>? value) => _valueStream.add(
Map.from(_valueStream.value)..addAll({dataId: value}),
);