Follow-up Comment #3, bug #68129 (group groff): In addition to Deri's concern in comment #2--or, perhaps, as a generalization of this concern--since Unicode provides the PUA for any use an end user might choose to make of it, and since groff output can be piped into some other program as input, groff should pass through any PUA code points in its input nondestructively so that it doesn't interfere with any other use of this area.
Groff already does this, so this isn't asking for any new accommodation, just
that whatever use someone might have made of this feature isn't clobbered.
$ echo 'a\[uE006]b' | groff -Tutf8 | head -1 | od -t x1
0000000 61 ee 80 86 62 0a
0000006
$
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