Try 'info' from Texinfo 4.13, and you will see the same case changes. I see. I never ran into that. I was just comparing against 5.1 info.
The bug in 5.0 inadvertently removed this feature.
It's not a feature, it's a bug. The program should report the text of
the actual index entry that was matched, not some randomly-capitalized
version thereof.
Since Sergey replied, happily leaving all to him :).
k
