Eli Zaretskii <eliz@is.elta.co.il> writes:
`M-c' (`capitalize-word') does not capitalize a word that is preceded
by an apostrophe when the cursor is at or before the apostrophe;
instead, the cursor moves to just after the word but the word is not
capitalized.
[...]
`M-u' (`upcase-word') continues past a word's trailing apostrophe.
I think that's because in Text mode, the apostrophe is considered a
word-constituent character.
Right. The question is: should capitalize-word capitalize the first
letter, or the first character? It seems reasonable to me to think that
the capitalization of a word like 'em should be 'Em. I.e., capitalize
the first letter, not the first word-constituent.