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[Informative] Observable changes because of Unicode 15.1 #3073

@mathiasbynens

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@mathiasbynens

Output of node compare.js:

$ node compare.js
Comparing Unicode v15.1.0 to Unicode v15.0.0…
Binary_Property: 3 new values
- IDS_Unary_Operator
- ID_Compat_Math_Continue
- ID_Compat_Math_Start
General_Category: 0 new values
Script: 0 new values
Script_Extensions: 0 new values
Binary_Property/ID_Start: 0 removals
Binary_Property/ID_Start: 0 new code points
Binary_Property/ID_Continue: 0 removals
Binary_Property/ID_Continue: 2 new code points
General_Category/Space_Separator: 0 removals
General_Category/Space_Separator: 0 new code points
Case_Folding=S: 0 removals
Case_Folding=S: 0 new code points
Case_Folding=F: 0 removals
Case_Folding=F: 0 new code points

The two new ID_Continue code points are U+200C (ZERO WIDTH NON-JOINER) and U+200D (ZERO WIDTH JOINER), meaning we can remove them as explicit additions from the ECMAScript spec. I’ll send a PR.

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