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closes #2
This follows the esbuild PR
https://github.com/evanw/esbuild/pull/3424
.Unicode 4.1 through Unicode 15 omitted these two characters from ID_Continue by accident. However, this accident was corrected in Unicode 15.1. Any JS VM that supports ES6+ but that uses a version of Unicode earlier than 15.1 will consider these to be a syntax error, so we deliberately omit these characters from the set of identifiers that are valid in both ES5 and ES6+. For more info see 2.2 in https://www.unicode.org/L2/L2023/23160-utc176-properties-recs.pdf