Inconsistent HK/TW glyph design for characters with ⿱敝 composition

[tamcy]

(Note: This also affects Source Han Serif. I can open an issue there if needed.)

The scope of this issue is limited to TW and HK glyphs.

This issue is about the (in)existence of the "hook" at the bottom-right of the 㡀 component in 敝 when 敝 is placed on top of other components, like 幣:

Standard-wise, HK and TW adopt a form with a hook on it. Same for JP and KR (too bad the direction of the two dots on top could be different so glyph sharing between JP/KR and HK/TW is almost impossible). CN isn't very consistent here - most of the characters are "hookless", with U+5F0A 弊, U+618B 憋, U+77A5 瞥 as the exceptions. 幣 is hookless, while its variant, 幤, comes with a hook. The rationale is unknown.

In Source Han Sans, the CN form follows the convenion. For TW and HK, shared glyphs aside (they are all CN glyphs with a hookless form), the design of the dedicated glyphs is not very consistent. For instance, uni5F0A-TW (弊) has a hook, uni5AF3-TW (嫳) doesn't. Similarly, uni6583-HK (斃) has a hook, but uni9F08-HK (鼈) doesn't.

Personally I'd like the "hook" form be used (i.e. adhere to HK/TW conventions), but I understand that it may not be possible at this moment given the technical limit. But still I think it's worth to iron out the inconsistencies at some point, so I list all the affected codepoints here for your investigation.

U+5AF3 嫳
U+5E63 幣
U+5F0A 弊
U+5F46 彆
U+618B 憋
U+6583 斃
U+7358 獘
U+77A5 瞥
U+864C 虌
U+87DE 蟞
U+8E69 蹩
U+9128 鄨
U+9C49 鱉
U+9DE9 鷩
U+9F08 鼈
U+210C7 𡃇

Thank you.