Łukasz Langa <luk...@langa.pl> added the comment:

Yes, this ship has sailed with Python 3.6.

I understand your logic and this is indeed why we didn't support this for a 
long time. However, people tend to grow muscle memory to add trailing commas 
and that was tripping them over for no real gain on our part. So this was 
added. The reason I found out about lib2to3 not following suit was that 3.6 
users quickly started to put those trailing commas in and tools using lib2to3 
were crashing on such files :) This proves it was worth it.

resolution:  -> fixed
stage: patch review -> commit review

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