Re: Display of undisplayable characters: \U01F3A8 instead of diamond

[Gregory Heytings]

I understand (academically) that once someone has adapted themselves to a particular set of bugs, shortcomings, and limitations

But here the bug was actually better from our perspective ...

In which case you still have at least two possibilities:

1. Use an earlier version of Emacs in which that bug is present.

2. Build your own patched Emacs in which that bug is restored.