Old Emoji defaults are misparsed

[eggrobin]

A look at the character.jsp page for A with history=full shows the following:

LATIN CAPITAL LETTER A was not, in fact, an emoji between Unicode 8 and Unicode 14.

However, it had this @missing line:
# @missing: 0000..10FFFF ; Emoji ; No

And since we are parsing that as a binary property, we conclude that the entire codespace has the Emoji property (and there is an extra ignored field).

[markusicu]

Right. @macchiati came up with this extended syntax, and at a glance it seemed reasonable, but it wasn't documented and didn't work with existing parsers because they don't read the value field there.

I noticed that when I tried to add @missing lines for certain Extended_Pictographic ranges with "Yes" defaults, because we don't have documented syntax to override a binary Yes with a No for poking holes into such ranges.

Context:

• write multiple ea/lb @missing lines #282

[markusicu]

See L2/22-124 item UCD17: “@missing lines do not work for binary properties”

[172-C16] Consensus: Remove @missing lines for binary properties where UCD syntax does not support them, and make other adjustments in UAX #44 and elsewhere for consistency; for Unicode Version 15.0.

[172-A73] Action Item for Ned Holbrook, Markus Scherer, PAG: In emoji-data.txt, remove the @missing lines; for Unicode Version 15.0.

[172-A74] Action Item for Ken Whistler, PAG: In UAX #44 (a) revert the changes to the paragraph that used to say that an @missing line is never provided for a binary property (so that it continues to say that for Unicode Version 15.0), and (b) change the example for multiple @missing lines from using Extended_Pictographic to using one of Bidi_Class, East_Asian_Width, Line_Break.

[172-A75] Action Item for Ken Whistler, PAG: In UAX #44 change text about @missing lines as per UCD17 in document L2/22-124, Section UCD17, item 3. For Unicode Version 15.0.

[172-A76] Action Item for Markus Scherer, PAG: Propose a UCD file syntax for explicit “No” values for binary properties, and use it for multiple @missing lines for Extended_Pictographic in emoji-data.txt; for a future version of the Unicode Standard. See L2/22-124 item UCD17.

A73..A75 got done.
We closed A76 after some discussion, without adding new syntax.