createRepeatedField<T> method
Creates List implementing a mutable repeated field.
Mixins may override this method to change the List type. To ensure that the protobuf can be encoded correctly, the returned List must validate all items added to it. This can most easily be done using the FieldInfo.check function.
Implementation
List<T> createRepeatedField<T>(int tagNumber, FieldInfo<T> fi) {
return PbList<T>(check: fi.check!);
}