21.5.31 Mule and the ’ symbol (input method?)

[Julian Bradfield]

On 2012-05-24, Stephen J. Turnbull <turnbull at sk.tsukuba.ac.jp> wrote:
> You don't want that if you can avoid it (that's a RIGHT SINGLE
> QUOTATION MARK, U+2019).  You want ʼ, if your fonts have it (that's
> MODIFIER LETTER APOSTROPHE U+02BC, which is preferred to the ASCII
> apostrophe).

No.
U+2019 is the preferred character for all normal uses of apostrophe.
The modifier letter, as the name suggests, is for use in the phonetic
symbol for ejectives, where it modifies the preceding letter. (I doubt
anybody uses it, though - I certainly don't.)
See Unicode Standard section 6.2 on apostrophes.