migration to uproot4?

[mmikhasenko]

Just learned recently that uproot us upgrading soon
https://github.com/scikit-hep/uproot4#uproot-3-vs-uproot-4
FYI: https://www.youtube.com/watch?v=ea-zYLQBS4U&feature=youtu.be

Will the UpROOT.jl be affected?

[oschulz]

Thanks for the heads-up! We should change UpROOT.jl to explicitly use uproot3, and then later migrate to uproot4 when it's feature-complete (support for file-writing).

[oschulz]

Since it looks like uproot4 still has way to go, we'll defer migration for now, but I'll keep the issue open for the future.

[oschulz]

@mmikhasenko , do you think uproot4 is ready now?

[mmikhasenko]

Unfortunately, I do not know. Did not use it for a while