[Bug 227409] mandoc(1) renders ".Aq" as something that looks weird in vt(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227409

--- Comment #2 from Ed Maste <emaste at freebsd.org> ---
Ah, on another system with LANG=en_CA.UTF-8 I get:

     Aq, Ao, Ac       enclose in angle brackets: ⟨text⟩

00004610  20 20 20 20 5f 08 41 5f  08 71 2c 20 5f 08 41 5f  |    _.A_.q, _.A_|
00004620  08 6f 2c 20 5f 08 41 5f  08 63 20 20 20 20 20 20  |.o, _.A_.c      |
00004630  20 65 6e 63 6c 6f 73 65  20 69 6e 20 61 6e 67 6c  | enclose in angl|
00004640  65 20 62 72 61 63 6b 65  74 73 3a 20 e2 9f a8 74  |e brackets: ...t|
00004650  65 78 74 e2 9f a9 0a 20  20 20 20 20 5f 08 45 5f  |ext....     _.E_|

which renders as [box]text[box] in both vt(4) and my default xterm font.

e2 9f a8 \xe2\x9f\xa8 is U+27E8 MATHEMATICAL LEFT ANGLE BRACKET
e2 9f a9 \xe2\x9f\xa9 is U+27E9 MATHEMATICAL RIGHT ANGLE BRACKET

I'm not sure what change caused us to go from <> to ⟨⟩.

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