Apostrophe from keyboard (') vs Apostrophe copy/paste ’

💬 General Discussion
2

27 (') typewriter apostrophe has been disallowed since inception (EIP-137) whereas 2019 (’) right apostrophe has always been valid.

From https://unicode.org/Public/idna/15.0.0/IdnaMappingTable.txt,

  • 27 is disallowed by line 0000..002C ; disallowed_STD3_valid # 1.1 <control-0000>..COMMA
  • 2019 is valid by line 2018..2023 ; valid ; ; NV8 # 1.1 LEFT SINGLE QUOTATION MARK..TRIANGULAR BULLET

The upcoming normalization change is only a convenience to make the right apostrophe more accessible.

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