[luatex] \hyphenpenalty not working

[Élie Roux]

> afaik (ex) hyphenpenalty is only applied with automatic discretionaries
> (the ones inserted by the hyphenation pass)

This doesn't seem the be the case with the attached example, it clearly 
shows that \hyphenpenalty is applied to explicit \discretionaries too...

Let's put it another way: how can I make LuaTeX behave the same way as 
pdfTeX on the last line of the attached example? I really need it for a 
software, and I don't believe it's possible by patchin nodes, isn't it?

Thank you,
-- 
Elie
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