[luatex] Hyphen char vs discretionary (bug?)

[Javier Bezos]

Hans,

>> 2) If not possible, which is the best alternative? A possibility
>> is to read the 'replace' list in the disc node, but I wonder if
>> there is a simpler approach.

> in case of a disc node you can look at the subtype

Sure, but the subtype only tells us there is an automatic
disc (=2), not the glyph (which may be changed with
\exhyphenchar). May I assume there is only a single glyph
in the 'replace' node list (namely, the char = \exhyphenchar
when the node list was built)?

Javier