Cyrillic Yat (ѣ) should respond to Yeri variants (cv79).

[jmcwilliams403]

rьѣ
Iosevka Aile Italic (as an example):

Notice how the italic form is currently automatic instead of with respect cv79.

Compared to Liberation Sans Italic:

[be5invis]

@dscorbett Are Yat and Yeri semantically related? I.e. the shape of Yat actually contain a Yeri, or just coincidence?

[dscorbett]

I don’t know whether they are originally related, but they have shared the same basic shape for centuries, so it would be reasonable to make them share a character variant feature. Compare Latin ⟨H⟩ and ⟨P⟩ with Cyrillic ⟨Н⟩ and ⟨Р⟩, whose shapes are unrelated but which use the same feature in Iosevka.

[jmcwilliams403]

In particular I'm mainly talking about these corners:

[jmcwilliams403]

Additionally, here's Noto Sans:

Notice the corner here, closer to Iosevka's rounded variant, not fully cursive:

[jmcwilliams403]

Here's Ubuntu Mono, but for the record it's better that we not entertain its toothless corner variant for the r/n shape part of yat: