[mrazomor]

In case using Kythe was an option, what was the rationale for not using it?

One major limitation of Kythe is handling different versions. For example, Kythe can produce a well connected index of Stackage, but a Hackage would have many holes (not all references would be found, as the unique reference name needs the library version). How Glean handles different library versions?

EDIT: the language agnostic view is already mentioned.