A trivial matter that proves to be not so trivial as it sounds.
The Unicode committee is very clear that U+2019 (RIGHT SINGLE QUOTATION MARK) should represent the English apostrophe.
Section 6.2 of the Unicode Standard 7.0.0 states:
U+2019 […] is preferred where the character is to represent a punctuation mark, as for contractions: “We’ve been here before.”
This is very, very wrong. The character you should use to represent the English apostrophe is U+02BC (MODIFIER LETTER APOSTROPHE). I’m here to tell you why why.
Using U+2019 is inconsistent with the rest of the standard
Earlier in section 6.2, the standard explains the difference between punctuation marks and modifier letters:
Punctuation marks generally break words; modifier letters generally are considered part of a word.
Consider any English word with an apostrophe, e.g. “don’t”. The word “don’t” is a single word. It is not the word “don” juxtaposed against the word “t”. The apostrophe is part of the word, which, in…
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