I find cabal 2.0.0.0 brings new change both in downloading package list and the hackage mirror.

1) 00-index.tar.gz has be replaced by 01-index.tar.gz

2) If timestamp.json exists and it is new enough, 01-index.tar.gz won't download, even though I don't have the latest copy of 01-index.tar.gz.

So my questions are

1) What else has been changed to hackage.haskell.org mirror?

I found four more files:

mirrors.json

root.json

snapshot.json

timestamp.json

2) Is it a feature or a bug?

Yours,

Yi