Why aren't the emoji modifiers GCB=Extend?

Karl Williamson public at khwilliamson.com
Fri Jun 19 15:51:20 CDT 2015

Someone writing code using Unicode 8 found that the FITZPATRICK 
modifiers are considered separate graphemes from what they modify.  This 
is surprising, and seems contrary to not only the concept of a grapheme 
cluster, but the spirit of tr51  2.2.3 "A supported emoji modifier 
sequence should be treated as a single grapheme cluster for editing 

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