lowercase letters in cursive don't match up with those in cascadia code about delugia-code

[Finii]

Cascadia Code has in fact two italic faces (one reachable via open type stylistic set iirc).
Will investigate on the weekend.

[Finii]

From your screenshot the lower case f and r are easily discernible.

As I already pointed out, the curly version that you attribut to Cascadia is not the normal Cascadia glyph but only in when a stylistic set is activated (screenshot of Cascadias landing page):

I believe this has been changed with the newest (2106.17) release of Cascadia related to Issue microsoft/cascadia-code#468 (for example have a look at comment microsoft/cascadia-code#468 (comment)).

So I think the consistency is already existing, but you do not compare against the newest Cascadia Code release.

(I did not check if SS01 is available in Delugia, but that would be another story anyhow. As we do not touch existing glyphs at all, I can not imaging that we deviate in that regard).

[Finii]

Check here https://github.com/microsoft/cascadia-code/releases/tag/v2106.17 for features and changes of the 2106.07 Cascadia release... ;)
(forgot to include the link in the comment above)

[Finii]

The SS01 is embedded also in Delugia.

You need to activate SS01 if you like the more curly versions more.
This is consistent with Cascadia.

Example (note ticked Stylistic Set 1 in the dialog to the right):