Yeah, HN strips trailing periods for the reason you stated. You can normally get around that by adding a hash/pound sign.
https://en.wikipedia.org/wiki/Google_LLC_v._Oracle_America,_...
https://en.wikipedia.org/wiki/Google_LLC_v._Oracle_America,_...
https://en.wikipedia.org/wiki/Google_LLC_v._Oracle_America,_....
Edit: huh? I pasted it in with the period and it gets removed. Do trailing periods get removed because it thinks it's the end of a sentence?
Anyway, this redirects to the right URL: https://en.wikipedia.org/wiki/Google_v_Oracle