BUG: cannot assign Base.reduce and others in JUNO julia REPL

That’s happening due to how we handle autocompletions, I think. Would be fixed with e.g.
https://github.com/JunoLab/Atom.jl/pull/125
which I hope to get into the next release.

Also see Inconsistent Base method overwrite behaviour, which would still be an issue even with the above PR.