I did not randomly pick 5.8.1 as requirement. There were many internal changes between 5.8.0 and 5.8.1 which made back-porting Data::Alias to 5.8.0 impossible. Yes, I tried.

I have to admit my choice to make Data::Alias engulf and supercede Data::Swap may not have been the good idea it seemed at the time, especially since I discovered that Data::Alias does not build properly on quite a few platforms.

I'll consider splitting off Data::Swap again.

In the mean time, please accept my sincere apologies for the inconvenience I caused.

UPDATE: split-off done