[Kognito]

Removing the inconsistency across different operating systems, I guess?

[nwellnhof]

There can even be inconsistencies after glibc upgrades.

[bzzzt]

Yes, you can run into that kind of stuff when configuring stuff like accent insensitive search. Most people just wrap the unstable function in a 'stable' wrapper which means you will have to reindex after an incompatible glibc update.