Confusing codepoints for Unicode strings

[jishnub]

julia> about("abα")
4-codeunit String (mutable) (<: AbstractString <: Any), occupies 4B directly (referencing 12B in total)
 • Character set: Unicode

 ┌╴'a'╶─┐┌╴'b'╶─┐┌╴'Î'╶─┐┌╴'±'╶─┐ 4 codepoints
 01100001011000101100111010110001

I found the breakdown into Î and ± confusing, as it's unclear how that relates to α

[tecosaur]

So, I'd like to show that α spans two codeunits, this is a bit tricky though the way that the display code is implemented.

This string display actually re-uses the dense vector display, and that's built around constant-size elements.

PRs welcome, or I'll get to this eventually 🙂