With p=earless-* , cyrl/er looks unnatural

[pv4]

Using p=earless-* causes cyrl/er to look unnatural, at least for me as for a native russian speaking person.

p=earless-* at first looks unnatural too but it seems more natural than cyrl/er=earless-*. That's probably because most of cyrillic letters are more cornered (at top and bottom) (вгджийклмнптухцчшщъыьюя) while most of latin letters are more rounded (abcdefghjmnopqrstu).

Moreover using n=earless-* and m=earless-* causes the dependent cyrl/pe.italic and cyrl/te.italic to have the top left ear while using p=earless-* causes cyrl/er.italic to NOT have the one, that may be considered as an inconsistency (but the main issue does not relate to the italic style only; it relates to the upright style as well).

The patch below fixes the issue for me by using cyrl/er=eared when p=earless-* is in use.

BUT PLEASE KEEP IN MIND THE FOLLOWING!

"Unnatural" look may be subjective to me. If there is a possibility to ask other russian native speaking people for their opinion relating to the issue, it would be better to do that before changing anything. As for me, I got used to p=earless-* look shortly and I was unable to get used to the related cyrl/er=earless-*.

diff -Napur Iosevka.orig/font-src/glyphs/letter/latin.ptl Iosevka/font-src/glyphs/letter/latin.ptl
--- Iosevka.orig/font-src/glyphs/letter/latin.ptl       2020-12-06 22:17:14.000000000 +0300
+++ Iosevka/font-src/glyphs/letter/latin.ptl    2020-12-08 05:53:37.509061983 +0300
@@ -3159,7 +3159,7 @@ glyph-block Letter-Latin-Lower-P : begin
                        include : SmallPSerifLB
 
        select-variant 'p' 'p'
-       alias 'cyrl.er' 0x440 'p'
+       select-variant 'cyrl/er' 0x440 (shapeFrom -- 'p')
 
        glyph-block-import Letter-Blackboard : BBS BBD BBBarLeft
        create-glyph 'mathbb/p' 0x1D561 : glyph-proc
diff -Napur Iosevka.orig/params/variants.toml Iosevka/params/variants.toml
--- Iosevka.orig/params/variants.toml   2020-12-06 22:17:14.000000000 +0300
+++ Iosevka/params/variants.toml        2020-12-08 05:47:27.517049027 +0300
@@ -813,21 +813,25 @@ tag = 'cv24'
 rank = 1
 description = '`p` with top-left ear'
 selector.p = 'eared'
+selector."cyrl/er" = "eared"
 
 [prime.p.variants.earless-corner]
 rank = 2
 description = '`p` without top-left ear (corner)'
 selector.p = 'earlessCorner'
+selector."cyrl/er" = "eared"
 
 [prime.p.variants.earless-rounded]
 rank = 3
 description = '`p` without top-left ear (rounded)'
 selector.p = 'earlessRounded'
+selector."cyrl/er" = "eared"
 
 [prime.p.variants.motion-serifed]
 rank = 4
 description = '`p` with motion serifs'
 selector.p = 'motionSerifed'
+selector."cyrl/er" = "motionSerifed"