add promote_rule for Index64

[Moelf]

fix #321

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.75%. Comparing base (08eb84c) to head (d240f26).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
+ Coverage   85.74%   85.75%   +0.01%     
==========================================
  Files          18       19       +1     
  Lines        2490     2492       +2     
==========================================
+ Hits         2135     2137       +2     
  Misses        355      355              

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[peremato]

Thanks @Moelf. I works nicely!

[peremato]

Would it be possible to make a new release such that I can release what I have which depends on UnROOT?

[Moelf]

@peremato feel free to do it if you have time. I personally would try to understand if using Index64 is bad to begin with or what... but we can always fix bugs later

[Moelf]

ok merging this because typemax(Int64) bits is more than 1 EB